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Kashrut (also kashruth or kashrus, כַּשְׁרוּת) is the set of Jewish dietary laws. Food that may be consumed according to halakha (Jewish law) is termed kosher in English, from the Ashkenazi pronunciation of the Hebrew term kashér (כָּשֵׁר), meaning "fit" (in this context, fit for consumption).
Among the numerous laws that form part of kashrut are the prohibitions on the consumption of unclean animals (such as pork, shellfish (both Mollusca and Crustacea) and most insects, with the exception of crickets and locusts), mixtures of meat and milk, and the commandment to slaughter mammals and birds according to a process known as shechita. There are also laws regarding agricultural produce (see Zeraim).
Most of the basic laws of kashrut are derived from the Torah's Books of Leviticus and Deuteronomy. Their details and practical application, however, are set down in the oral law (eventually codified in the Mishnah and Talmud) and elaborated on in the later rabbinical literature. While the Torah does not state the rationale for most kashrut laws, many reasons have been suggested, including philosophical, practical and hygienic.
Over the past century, there have developed numerous rabbinical organizations that certify products, manufacturers, and restaurants as kosher, usually using a symbol (called a hechsher) to indicate their support. Presently, about a sixth of American Jews fully keep kosher, and many more abstain from some non-kosher foods, especially pork. Kashrut is also kept by some non-Jews, often for health reasons.
Prohibited foods 
The laws of kashrut can be classified according to the origin of the prohibition (Biblical or rabbinical) and whether the prohibition concerns the food itself or a mixture of foods.
Biblically prohibited foods include:
- Non-kosher animals and birds (based on Leviticus 11:3–8 and Deuteronomy 14:3–21): mammals require certain identifying characteristics (cloven hooves and being ruminants), while birds require a tradition that they can be consumed. Fish require scales and fins (thus excluding catfish). All invertebrates are non-kosher apart from a certain type of locust, on which most communities lack a clear tradition. No reptiles or amphibians are kosher.
- Carrion (nevelah): meat from a kosher animal that has not been slaughtered according to the laws of shechita.
- Injured (terefah): an animal with a significant defect or injury, such as a fractured bone or particular types of lung adhesions.
- Blood (dam): blood of kosher mammals and fowl is removed through salting, with special procedures for the liver, which is very rich in blood.
- Particular fats (chelev): particular parts of the abdominal fat of cattle, goats and sheep must be removed by a process called nikkur.
- The twisted nerve (gid hanasheh): the sciatic nerve, as according to Genesis 32:32 the patriarch Jacob's was damaged when he fought with an angel, cannot be eaten and is removed by nikkur.
- Limb of a living animal (ever min ha-chai): according to Genesis 9:4, a limb torn from an animal that is still alive may not be consumed; this law is considered applicable even to non-Jews.
- Untithed food (tevel): produce of the Land of Israel requires the removal of certain tithes, which in ancient times were given to the Kohanim (priests), Levites and the poor (terumah, maaser rishon and maaser ani respectively).
- Fruit during the first three years (orlah): according to Leviticus 19:23, fruit from a tree in the first three years after planting cannot be consumed (both in the Land of Israel and the diaspora). This applies also to the fruit of the vine - grapes, and wine produced from them.
- New grain (chadash): in Leviticus 23:14 the Bible prohibits newly grown grain (planted after Passover the previous year) until the second day of Passover; there is debate as to whether this law applies to grain grown outside the Land of Israel.
- Wine of libation (yayin nesekh): wine that may have been dedicated to idolatrous practices.
Biblically prohibited mixtures include:
- Mixtures of meat and milk (basar be-chalav): this law derives from the broad interpretation of the commandment not to "cook a kid in its mother's milk" (Exodus 23:19, Exodus 34:26, and Deuteronomy 14:21); other non-kosher food may be used for other benefit (e.g. sold to non-Jews), but mixtures of meat and milk are prohibited even with regards to other benefit.
- Plants grown together (kilayim): in the Land of Israel plants are to be grown separately and not in close proximity according to Leviticus 19:19 and Deuteronomy 22:9-11. A specific subdivision of this law is kil'ei ha-kerem, the prohibition of planting any grain of vegetable near a grapevine; this law applies to Jews throughout the world, and one may not derive benefit from the produce.
Rabbinically prohibited foods include:
- Non-Jewish milk (chalav akum): milk that may have an admixture of milk from non-kosher animals (see below for current views on this prohibition).
- Non-Jewish cheese (gevinat akum): cheese that may have been produced with non-kosher rennet.
- Non-Jewish wine (stam yeinam): wine that while not produced for idolatrous purposes may otherwise have been poured for such a purpose or alternatively when consumed will lead to intermarriage.
- Food cooked by a non-Jew (bishul akum): this law was enacted for concerns of intermarriage.
- Non-Jewish bread (pat akum): this law was enacted for concerns of intermarriage.
- Health risk (sakanah): certain foods and mixtures are considered a health risk, such as mixtures of fish and meat.
Permitted and forbidden animals 
Only meat from particular species is permissible. Mammals that both chew their cud (ruminate) and have cloven hooves can be kosher. Animals with one characteristic but not the other (the camel, the hyrax and the hare because they have no cloven hooves, and the pig because it does not ruminate) are specifically excluded (Leviticus 11:3–8). In 2008, a rabbinical ruling determined that giraffes and their milk are eligible to be considered kosher. The giraffe has both split hooves and chews its cud, characteristics of animals considered kosher. Findings from 2008 show that giraffe milk curdles, meeting kosher standards. Although kosher, the giraffe is not slaughtered today because the process would be very costly. Giraffes are difficult to restrain, and their use for food could cause the species to become endangered.
Non-kosher birds are listed outright (Deuteronomy 14:12–18) but the exact zoological references are disputed and some references refer to families of birds (24 are mentioned). The Mishnah refers to four signs provided by the sages. First, a dores (predatory bird) is not kosher. Additionally, kosher birds possess three physical characteristics: an extra toe in the back (which does not join the other toes in supporting the leg), a zefek (crop), and a korkoban (gizzard) with a peelable lumen. However, individual Jews are barred from merely applying these regulations alone; an established tradition (masorah) is necessary to allow birds to be consumed, even if it can be substantiated that they meet all four criteria. The only exception to this is turkey. There was a time when certain authorities considered the signs enough, so Jews started eating this bird without a masorah because it possesses all the signs (simanim in Hebrew).
Fish must have fins and scales to be kosher (Leviticus 11:9–12). Shellfish and other non-fish water fauna are not kosher. Here is a list of kosher species of fish. Insects are not kosher except for certain species of kosher locust. Generally any animal that eats other animals, whether they kill their food or eat carrion (Leviticus 11:13–31), is not kosher, as well as any animal that was partially eaten by other animals (Exodus 22:30-31).
|Mammals||Carnivores; animals that do not chew the cud (e.g. the pig); animals that do not have cloven hooves (e.g., the camel, the hyrax, the hare)|
|Birds||Birds of prey; scavengers|
|Reptiles and amphibians||All|
|Water animals||Those that do not have both fins and scales|
|Insects||All, except a particular type of locust that, according to most, cannot be identified today|
Separation of meat and milk 
|This section requires expansion with: information on how interpretation developed. (March 2013)|
Meat and milk (or derivatives) cannot be mixed (Deuteronomy 14:21) in the sense that meat and dairy products are not served at the same meal, served or cooked in the same utensils, or stored together. Observant Jews have separate sets of dishes, and sometimes different kitchens, for meat and milk, and wait anywhere between one and six hours after eating meat before consuming milk products. The milchig and fleishig utensils and dishes are the commonly referred to Yiddish delineations between dairy and meat (lit. milky and meaty) utensils and dishes respectively.
Kosher slaughter 
Mammals and fowl must be slaughtered by a trained individual (a shochet) using a special method of slaughter, shechita (Deuteronomy 12:21). Among other features, shechita slaughter severs the jugular vein, carotid artery, esophagus and trachea in a single continuous cutting movement with an unserrated, sharp knife. Failure of any of these criteria renders the meat of the animal unsuitable. The body must be checked after slaughter to confirm that the animal had no medical condition or defect that would have caused it to die of its own accord within a year, which would make the meat unsuitable. These conditions (treifot) include 70 different categories of injuries, diseases, and abnormalities whose presence renders the animal non-kosher. It is forbidden to consume certain parts of the animal, such as certain fats (chelev) and the sciatic nerves from the legs. As much blood as possible must be removed (Leviticus 17:10) through the kashering process; this is usually done through soaking and salting the meat, but the liver, as it is rich in blood, is grilled over an open flame. Fish (and locusts, for those follow the traditions permitting them) must be killed before being eaten, but no particular method has been specified in Jewish law.
Kosher utensils 
Utensils used for non-kosher foods become non-kosher, and make even otherwise kosher food prepared with them non-kosher. Some such utensils, depending on the material they are made from, can be made suitable for preparing kosher food again by immersion in boiling water or by the application of a blowtorch. Food prepared by Jews in a manner that violates the Shabbat (Sabbath) may not be eaten until the Shabbat is over.
Passover laws 
Passover has special dietary rules, the most important of which is the prohibition on eating leavened bread or derivatives of this, which are known as chametz. This prohibition is derived from Exodus 12:15. Utensils used in preparing and serving chametz are also forbidden on Passover unless they have been cleansed (kashered). Observant Jews often keep separate sets of meat and dairy utensils for Passover use only. In addition, some groups follow various eating restrictions on Passover that go beyond the rules of kashrut, such as not eating gebrochts or garlic.
Produce of the Land of Israel 
Biblical rules control the use of agriculture produce. For produce grown in the Land of Israel a modified version of the biblical tithes must be applied, including Terumat HaMaaser, Maaser Rishon, Maaser Sheni, and Maaser Ani (untithed produce is called tevel); the fruit of the first three years of a tree's growth or replanting are forbidden for eating or any other use as orlah; produce grown in the Land of Israel on the seventh year is Shvi'it, and unless managed carefully is forbidden as a violation of the Shmita (Sabbatical Year). Some rules of kashrut are not universally observed. For example, many hold that the rule against eating chadash (new grain) before the 16th of the month Nisan does not apply outside the Land of Israel.
Many vegetarian restaurants and producers of vegetarian foods acquire a hechsher, certifying that a Rabbinical organization has approved their products as being kosher. The hechsher usually certifies that certain vegetables have been checked for insect infestation and steps have been taken to ensure that cooked food meets the requirements of bishul Yisrael. Vegetables such as lettuce, cabbage, broccoli and cauliflower must be checked for insect infestation. The proper procedure for inspecting and cleaning varies by species, growing conditions, and views of individual rabbis.
Pareve foods 
Some processes convert a meat or dairy product into a pareve (neither meat nor dairy) one. For example, rennet is sometimes made from stomach linings, yet is acceptable for making kosher cheese, but such cheeses might not be acceptable to some vegetarians, who would eat only cheese made from a vegetarian rennet. The same applies to kosher gelatin, an animal product, supposedly derived from kosher animal sources. Other gelatin-like products from non-animal sources such as agar agar and carageenan are pareve by nature. Fish gelatin is derived from fish and is therefore (like all kosher fish products) pareve. Eggs are also considered pareve despite being an animal product.
Kashrut has procedures by which equipment can be cleaned of its previous non-kosher use, but that might be inadequate for those with allergies, vegetarians, or adherents to other religious statutes. For example, dairy manufacturing equipment can be cleaned well enough that the rabbis grant pareve status to products manufactured with it. Nevertheless, someone with a strong allergic sensitivity to dairy products might still react to the dairy residue, and that is why some products that are legitimately pareve carry "milk" warnings.
Philosophical explanations 
Jewish philosophy divides the 613 mitzvot into three groups—laws that have a rational explanation and would probably be enacted by most orderly societies (mishpatim), laws that are understood after being explained but would not be legislated without the Torah's command (edot), and laws that do not have a rational explanation (chukim). Some Jewish scholars say that kashrut should be categorized as laws for which there is no particular explanation, since the human mind is not always capable of understanding divine intentions. In this line of thinking, the dietary laws were given as a demonstration of God's authority, and man must obey without asking why. However, Maimonides believed that Jews were permitted to seek out reasons for the laws of the Torah.
Some theologians have said that the laws of kashrut are symbolic in character: Kosher animals represent virtues, while non-kosher animals represent vices. The 1st century BCE Letter of Aristeas argues that the laws "have been given ... to awake pious thoughts and to form the character". This view reappears in the work of the 19th century Rabbi Samson Raphael Hirsch.
The Torah prohibits "seething the kid (goat, sheep, calf) in its mother's milk". While the Bible does not provide a reason, it has been suggested that the practice was perceived as cruel and insensitive.
Hasidism believes that everyday life is imbued with channels connecting with Divinity, the activation of which it sees as helping the Divine Presence to be drawn into the physical world; Hasidism argues that the food laws are related to the way such channels, termed sparks of holiness, interact with various animals. These sparks of Holiness are released whenever a Jew manipulates any object for a holy reason (which includes eating); however, not all animal products are capable of releasing their sparks of holiness. The Hasidic argument is that animals are imbued with signs that reveal the release of these sparks, and the signs are expressed in the biblical categorization of ritually clean and ritually unclean;
According to Christian theologian Gordon J. Wenham, the purpose of kashrut was to help Jews maintain a distinct and separate existence from other peoples; he says that the effect of the laws was to prevent socialization and intermarriage with non-Jews, preventing Jewish identity from being diluted. Wenham argued that since the impact of the food laws was a public affair, this would have enhanced Jewish attachment to them as a reminder of their distinct status as Jews.
Health explanations 
There have been attempts to provide empirical support for the view that Jewish food laws have an overarching health benefit or purpose, one of the earliest being from Maimonides in his Guide for the Perplexed. In 1953, David Macht, an Orthodox Jew and proponent of the theory of biblical scientific foresight, conducted toxicity experiments on many kinds of animals and fish. His experiment involved lupin seedlings being supplied with extracts from the meat of various animals; Macht reported that in 100% of cases, extracts from ritually unclean meat inhibited the seedling's growth more than that from ritually clean meats. At the same time, these explanations are controversial. Scholar Lester L. Grabbe, writing in the Oxford Bible Commentary on Leviticus, states that "[a]n explanation now almost universally rejected is that the laws in this section [Leviticus 11-15] have hygiene as their basis. Although some of the laws of ritual purity roughly correspond to modern ideas of physical cleanliness, many of them have little to do with hygiene. For example, there is no evidence that the 'unclean' animals are intrinsically bad to eat or to be avoided in a Mediterranean climate, as is sometimes asserted."
Supervision and marketing 
Certain foods must be prepared in whole or in part by Jews. This includes grape wine, certain cooked foods (bishul akum), cheese (gvinat akum), and according to some also butter (chem'at akum); dairy products (Hebrew: חלב ישראל chalav Yisrael "milk of Israel"); and bread (Pas Yisroel).
Product labeling standards 
Although reading the label of food products can identify obviously non-kosher ingredients, some countries allow manufacturers to omit identification of certain ingredients. Such "hidden" ingredients may include lubricants and flavorings, among other additives; in some cases, for instance, the use of natural flavorings, these ingredients are more likely to be derived from non-kosher substances. Furthermore, certain products, such as fish, have a high rate of mislabeling, which may result in a non-kosher fish being sold in a package labeled as a species of kosher fish.
Producers of foods and food additives can contact Jewish religious authorities to have their products certified as kosher: this involves a visit to the manufacturing facilities by an individual rabbi or a committee from a rabbinic organization, who will inspect the production methods and contents, and if everything is sufficiently kosher a certificate would be issued.
Manufacturers sometimes identify the products that have received such certification by adding particular graphical symbols to the label. These symbols are known in Judaism as hechsherim. Due to differences in kashrut standards held by different organizations, the hechsheirim of certain Jewish authorities may at times be considered invalid by other Jewish authorities. The certification marks of the various rabbis and organisations are too numerous to list, but one of the most commonly used in the United States of America is that of the Union of Orthodox Congregations, who use a U inside a circle, symbolising the initials of Orthodox Union. A single K is sometimes used as a symbol for kosher, but since many countries do not allow letters to be trademarked (the method by which other symbols are protected from misuse), it only indicates that the company producing the product claims that it is kosher.
Many of the certification symbols are accompanied by additional letters or words to indicate the category of the product, according to Jewish law; the categorisation may conflict with legal classifications, especially in the case of food that Jewish law regards as dairy, but legal classification does not.
- DE—Dairy equipment
- M—Meat, including poultry
- Pareve—Food that is neither meat nor dairy
- P—Passover-related (P is not used for Pareve)
In many cases constant supervision is required because, for various reasons, such as changes in manufacturing processes, products that once were kosher may cease to be so. For example, a kosher lubricating oil may be replaced by one containing tallow, which many rabbinic authorities view as non-kosher. Such changes are often co-ordinated with the supervising rabbi, or supervising organisation, to ensure that new packaging does not suggest any hechsher or kashrut. In some cases, however, existing stocks of pre-printed labels with the hechsher may continue to be used on the now non-kosher product. An active grapevine among the Jewish community discusses which products are now questionable, as well as products which have become kosher but whose labels have yet to carry the hechsher. Some newspapers and periodicals also discuss kashrut products.
Products labeled kosher-style are non-kosher products that have characteristics of kosher foods, such as all-beef hot dogs, or are flavored or prepared in a manner consistent with Ashkenazi practices, like dill pickles. The designation usually refers to delicatessen items.
History of kosher marketing 
In 1911, Procter & Gamble was the first company to advertise that their product, Crisco, was kosher. Over the next two decades, companies such as Lender's Bagels, Maxwell House, Manischewitz, and Empire evolved and gave the kosher market more shelf space. In the 1960s, Hebrew National hotdogs launched a "we answer to a higher authority" campaign to appeal to Jews and non-Jews alike. From that point on, kosher became a symbol for both quality and value. The kosher market quickly expanded, and with it more opportunities for kosher products. According to Menachem Lubinsky, founder of the Kosherfest trade fair, there may be as many as 14 million kosher consumers and $40 billion in sales of kosher products in the USA.
Legal usage 
Advertising standards laws in many jurisdictions prohibit the use of the phrase kosher in a product's labelling, unless it can be shown that the product conforms to Jewish dietary laws; however, the legal qualifications for conforming to Jewish dietary laws are often defined differently in different jurisdictions. For example, in some places the law may require that a rabbi certify the kashrut nature, in others the rules of kosher are fully defined in law, and in others still it is sufficient that the manufacturer only believes that the product complies with Jewish dietary regulations. In several cases, laws restricting the use of the term kosher have later been determined to be illegal religious interference.
Society and culture 
About one-sixth of American Jews maintain the kosher diet. Many Jews observe kashrut partially, by abstaining from pork or shellfish, or not drinking milk with a meat dish. Some keep kosher at home but will eat in a non-kosher restaurant. In 2012, one analysis of the specialty food market in North America estimated that only 15% of Kosher consumers were Jewish. A sizable non-Jewish segment of the population views kosher certification as an indication of wholesomeness. Strict vegetarians, Muslims, Hindus, and people with allergies to dairy foods, often consider the kosher-pareve designation as an assurance that a food contains no animal-derived ingredients, including milk and all of its derivatives, although the products still might contain fish or eggs.
Kosher (כשר) in Ancient Hebrew means be advantageous, proper, suitable, or succeed  according to the Brown-Driver-Briggs Hebrew and English Lexicon. In Modern Hebrew, it generally refers to kashrut but can also sometimes mean "proper". For example, the Babylonian Talmud uses kosher in the sense of virtuous, when referring to the Dãrayavahush I (known in English, via Latin, as Darius) as a "kosher king"; Darius, a Persian King, assisted in building the Second Temple. In English, kosher often means legitimate, acceptable, permissible, genuine, or authentic.
The word kosher is also part of some common product names. Sometimes it is used as an abbreviation of koshering, meaning the process for making something kosher; for example, kosher salt is a form of salt with irregularly shaped crystals, making it particularly suitable for preparing meat according to the rules of kashrut, because the increased surface area of the crystals absorbs blood more effectively. At other times it is used as a synonym for Jewish tradition; for example, a kosher dill pickle is simply a pickle made in the traditional manner of Jewish New York City pickle makers, using a generous addition of garlic to the brine, and is not necessarily compliant with the traditional Jewish food laws.
See also 
- Comparison of Islamic and Jewish dietary laws
- Jewish cuisine
- Kosher foods
- Kosher tax
- Sabbath food preparation
- Halal, Islamic dietary laws
- Unclean animal
- Forst, Binyomin (1994). The laws of kashrus: a comprehensive exposition of their underlying concepts and applications. Brooklyn, N.Y: Mesorah Publications. pp. 32–49. ISBN 0-89906-103-6.
- Doron-spalter, Pinchos (2008). Major Concepts of the Talmud: An Encyclopedic Resource Guide, Volume 1. Targum Press. p. 7. ISBN 978-1-56871-465-3. Retrieved March 15, 2013.
- Blech, Zushe Yosef (January 27, 2009). Kosher Food Production. Wiley-Blackwell. ISBN 978-0-8138-2093-4.
- Shulchan Aruch, Yoreh De'ah 79
- For a comprehensive review of the issue involving the difficulty that neither the hyrax nor the hare are ruminants, see Rabbi Natan Slifkin's "The Camel, the Hare and the Hyrax."
- Slifkin, Nosson (2004). The Camel, the Hare & the Hyrax: A Study of the Laws of Animals with One Kosher Sign in Light of Modern Zoology (illustrated ed.). Zoo Torah in association with Targum/Feldheim. ISBN 978-1-56871-312-0..
- Butcher, Tim (June 6, 2008). "Giraffe is kosher, rabbis rule in Israel". The Daily Telegraph. Retrieved April 10, 2013.
- Shulchan Aruch, Yoreh De'ah 82:1–5
- Zivotofsky, Ari Z. "What's the Truth About Giraffe Meat!". Kashrut.com. Retrieved May 22, 2013.
- Bavli Chullin 3:22–23
- Zivotofsky, Ari Z. "Is Turkey Kosher?, part 2". Kashrut.com. Retrieved May 22, 2013.
- Zivotofsky, Ari Z. "Is Turkey Kosher?, part 3". Kashrut.com. Retrieved May 22, 2013.
- Shulchan Aruch, Yoreh De'ah 83 and 84
- Shulchan Aruch, Yoreh De'ah 85
- Shulchan Aruch, Yoreh De'ah 87 et seq
- "Kashrut: Jewish Dietary Laws". Jewish Virtual Library. Retrieved May 22, 2013.
- Shulchan Aruch, Yoreh De'ah 1–65
- Shulchan Aruch Yoreh De'ah 66–78
- "ABCs of Kosher". Aish HaTorah. Retrieved March 15, 2013.
- "Locusts Go Biblical — But Are They Kosher?". The Forward. Retrieved March 15, 2013.
- Shulchan Aruch, Orach Chayim, 318:1
- Shulchan Aruch, Orach Chayim, 431–452
- Brenner, Bayla Sheva. "Keeping Up with Passover Trenditions". OUKosher.org. Orthodox Union. Retrieved May 22, 2013.
- Davidson, Baruch S. "Which vegetables may be eaten on Passover?". Chabad.org. Retrieved May 22, 2013.
- Heinemann, Moshe. "Terumos and Ma’asros". Star-K. Retrieved April 10, 2013.
- Posner, Menachem. "What is "Yashan"?". Chabad.org. Retrieved March 15, 2013.
- Posner, Eliezer. "Are vegan restaurants automatically kosher?". Chabad.org. Retrieved March 15, 2013.
- "Why Check for Insects?". Star-K. Retrieved March 15, 2013.
- The rennet must be kosher, either microbial or from special productions of animal rennet using kosher calf stomachs.Oukosher.org, Retrieved August 10, 2005.
- "Meat, Dairy and Pareve". OK Kosher Certification. Retrieved March 15, 2013.
- "Kosher Consumer Misconsumptions". Star-K. Retrieved March 15, 2013.
- William H. Shea, Clean and Unclean Meats, Biblical Research Institute, December 1998 (archived from the original on February 12, 2008)
- Mishneh Torah Korbanot, Temurah 4:13 (in eds. Frankel; "Rambam L'Am")
- Letter of Aristeas, 145–154
- "Dietary Laws". Encyclopedia Judaica. Jerusalem: Keter Publishing House. 1971.
- Gottlieb, Roger S. (2006). The Oxford Handbook of Religion and Ecology. Oxford Handbooks Online. p. 45. ISBN 0-19-517872-6. Retrieved October 18, 2012. quoting Deuteronomy Rabbah 6:1
- Chill, Abraham (1974). The mitzvot: the commandments and their rationale. Bloch Publishing Company. p. 114. ISBN 0-8197-0376-1.
- Schneersohn, Yosef Yitzchak. "The Chassidic Masters on Food and Eating". Chabad.org. Retrieved April 10, 2013.
- Tauber, Yanki. "Meat". Chabad.org. Retrieved April 10, 2013.
- Borukhovich, Shneur Zalman. "The Tanya Chapter 8". Chabad.org. Retrieved April 10, 2013.
- Re'eh, rabbifriedman.org (archived from the original on August 29, 2007).
- Gordon J. Wenham, The Theology of Unclean Food, The Evangelical Quarterly 53, January March 1981, pp.6–15
- Macht, Dr. David I. (September–October 1953). An Experimental Pharmalogical Appreciation of Leviticus XI and Deuteronomy XIV (pdf). XXXVII (5). Bulletin of the History of Medicine. pp. 444–450.
- Macht 1953 op. cit.
- The Oxford Bible Commentary, eds. J. Barton and J. Muddiman. Oxford: Oxford University Press. 2001: 99.
- Shulchan Aruch, Yoreh De'ah 114
- Shulchan Aruch, Yoreh De'ah 113
- Shulchan Aruch, Yoreh De'ah 115
- Many rely on lenient rulings by Rabbi Moshe Feinstein in Teshuvot Igrot Moshe. Yoreh De'ah 1:47 and other 20th century rabbinic authorities who rule that strict government supervision prevents the admixture of non-kosher milk, making supervision unnecessary. See also Rabbi Chaim Jachter. "Chalav Yisrael – Part I: Rav Soloveitchik's View". Retrieved December 2, 2007.
- Shulchan Aruch, Yoreh De'ah 112, Orach Chayim 603
- "What foods are kosher?". Oxford Chabad Society. Retrieved March 15, 2013.
- Rosenthal, Elizabeth (May 26, 2011). "Tests Reveal Mislabeling of Fish". The New York Times. Retrieved May 22, 2013.
- "How to choose a kosher certification". Kashrut.com. Retrieved March 15, 2013.
- "About this web-site". Hechshers.info. Retrieved March 15, 2013.
- "Kosher Certification". Chabad.org. Retrieved March 15, 2013.
- "Glossary of Kosher Terms". Kosherfest. Retrieved March 15, 2013.
- "Kosher Supervision". OK Kosher Certification. Retrieved March 15, 2013.
- Zeldes, Leah A. (July 8, 2010). "Know your wiener!". Dining Chicago. Chicago's Restaurant & Entertainment Guide, Inc. Retrieved July 31, 2010.
- Zeldes, Leah A. (July 20, 2010). "Origins of neon relish and other Chicago hot dog conundrums". Dining Chicago. Chicago's Restaurant & Entertainment Guide, Inc. Retrieved July 31, 2010.
- Heinze, Andrew R. (1 August 1992). Adapting to Abundance: Jewish Immigrants, Mass Consumption, and the Search for American Identity. Columbia University Press. p. 176. ISBN 978-0-231-06853-6. Retrieved March 15, 2013.
- "The History of Kosher". Kosherfest. Retrieved March 15, 2013.
- Popovsky, Mark. "The Constitutional Complexity of Kosher Food Laws". Columbia University. Retrieved March 15, 2013.
- Gertz, Emily (September 25, 2008). "Is Keeping Kosher Good for the Environment?". Scientific American. Retrieved March 14, 2013.
- "The Specialty Food Market in North America". Market Information. Agri-Food Trade Service, Canada. March 2012.
- "Who Eats Kosher? Do You Have to Be Jewish to Eat Kosher?". Kosher Directory. Retrieved March 14, 2013.
- "A Hebrew and English lexicon of the Old Testament". Palmer Theological Seminary.
- Tractate Rosh Hashanah 3b, Schottenstein Edition, Mesorah Publications Ltd.
- Eric Partridge, Tom Dalzell, Terry Victor (2006). The New Partridge Dictionary of Slang and Unconventional English: Volume 2, J-Z. Taylor & Francis. p. 388. ISBN 0-415-25938-X.
- B.A. Phythian (1976). A concise dictionary of English slang and colloquialisms. The Writer, Inc. p. 110. ISBN 0-87116-099-4. "Kosher Genuine. Fair. Acceptable."
- Rich, Tracy. "Kashrut: Jewish Dietary Laws". Jewfaq.org. Retrieved March 14, 2013.
- Bowen, Dana; Ralph, Nancy. "FROM PICKLE DAY EXHIBITS: What is a Pickle?". New York Food Museum. Retrieved March 14, 2013.
Further reading 
- Samuel H. Dresner; Seymour Siegel, David M. Pollock (1982). The Jewish Dietary Laws. United Synagogue Book Service. ISBN 978-0-8381-2105-4.
- Isidor Grunfeld (1982). The Jewish Dietary Laws: Dietray laws regarding plants and vegetables, with particular reference to the produce of the Holy Land. ISBN 0-900689-22-6.
- Isaac Klein, A Guide to Jewish Religious Practice, JTSA, 1992
- David C. Kraemer, Jewish Eating and Identity Throughout the Ages, Routledge, 2008
- James M. Lebeau, The Jewish Dietary Laws: Sanctify Life, United Synagogue of Conservative Judaism, New York, 1983
- Yacov Lipschutz, Kashruth: A Comprehensive Background and Reference Guide to the Principles of Kashruth. New York: Mesorah Publications Ltd, 1989
- Jordan Rosenblum (2010-05-17). Food and Identity in Early Rabbinic Judaism. ISBN 978-0-521-19598-0.
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- ABCs of Kosher
- A useful guide to the issues of kashrut
- Kosher – A guide to Eating Jewishly
- Kosher – Kosher certification from the OU