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Forbidden fruit is a phrase that originates from Genesis concerning Adam and Eve in Genesis 2:16–17. In the narrative, the fruit good and Evil]] and was eaten by Adam and Eve in the Garden of Eden. As a metaphor, the phrase typically refers to any indulgence or pleasure that is considered illegal or immoral.
Identifying the fruit 
Potential forbidden fruits of the Garden of Eden include the apple, pomegranate, the fig, the carob, the etrog or citron, the pear, and, more recently, the datura. The pseudepigraphic Book of Enoch describes the tree of knowledge: "It was like a species of the Tamarind tree, bearing fruit which resembled grapes extremely fine; and its fragrance extended to a considerable distance. I exclaimed, How beautiful is this tree, and how delightful is its appearance!" (1 Enoch 31:4).
One alternative view is that the forbidden fruit is not a fruit at all, but a metaphorical one. The fruit of the womb, aka sex and procreation from the tree of life.
In Western Europe, the fruit was often depicted as an apple, possibly because of a misunderstanding of, or a pun on mălum, a native Latin noun which means evil (from the adjective malus), and mālum, another Latin noun, borrowed from Greek μῆλον, which means apple. In the Vulgate, Genesis 2:17 describes the tree as de ligno autem scientiae boni et mali: "but of the tree (lit. wood) of knowledge of good and evil" (mali here is the genitive of malum). The larynx in the human throat, noticeably more prominent in males, was consequently called an Adam's apple, from a notion that it was caused by the forbidden fruit sticking from Adam's throat as he swallowed. -- Another theory as to why the Apple was chosen as the "Forbidden Fruit," is the fact that when you cut an apple in half sideways (horizontally across its middle), then look at the center of each half - the "seeded" section - you will see the unmistakable image of a Pentagram. Some individuals have postulated that the Apple was selected by the early Roman Catholic Church as being the "Forbidden Fruit" due to the image of a Pentagram found at its center.
Rabbi Meir says that the fruit was a grape, made into wine. The Zohar explains similarly that Noah attempted (but failed) to rectify the sin of Adam by using grape wine for holy purposes. The midrash of Bereishis Rabah states that the fruit was grape, or squeezed grapes (perhaps alluding to wine).
Rabbi Nechemia says that the fruit was a fig, as it was from fig leaves that God made garments for Adam and Eve upon expelling them from the Garden. "By that with which they were made low were they rectified."
Since the fig is a long-standing symbol of female sexuality, it enjoyed a run as a favorite understudy to the apple as the forbidden fruit during the Italian Renaissance. The most famous depiction of the fig as the forbidden fruit was painted by Michelangelo Buonarroti in his masterpiece fresco on the Sistine Chapel ceiling.
Proponents of the theory that the Garden of Eden was located somewhere in what is now known as the Middle East suggest that the fruit was actually a pomegranate, partly because it was native in the region. This ties in with the Greek myth of Persephone, where her consumption of four pomegranate seeds leads to her having to spend time in Hades. Most importantly, Pomegranates were embroidered on the helm of the high priest's robe. see Exodus 28:33, 39:24-25.
A fresco in the 13th-century Plaincourault Abbey in France depicts Adam and Eve in the Garden of Eden, flanking a Tree of Knowledge that has the appearance of a gigantic Amanita muscaria, a poisonous and psychoactive mushroom. Writer/philosopher Terence McKenna in the entheogen theory proposed that the fruit of knowledge was a reference to psychotropic plants and fungus, which played a central role, he theorized, in human intellectual evolution. Earlier, in a well-documented and heavily-criticized study, John M. Allegro proposed the mushroom as the forbidden fruit. In 2009, author Jan Irvin provided a thorough historical analysis and reevaluation of some of Allegro's critics, and argues that current scholarship vindicates Allegro's discovery.
Genesis 1:29 states: And God said, Behold, I have given you every herb bearing seed, which is upon the face of all the earth, and every tree, in the which is the fruit of a tree yielding seed; to you it shall be for meat. Further,Genesis 1:30 states: And to every beast of the earth, and to every fowl of the air, and to every thing that creepeth upon the earth, wherein there is life, I have given every green herb for meat: and it was so. "Meat" as defined by  is: the edible part of anything, as a fruit or nut.
In the Book of Enoch  chapt. 1, verse 69: "And the third was named Gadreeel: he it is that showed the children of men all the blows of death, and he led astray Eve, and showed [the weapons of death to the sons of men], the shield and the coat of mail, and the sword for battle, and all the weapons of death to the children of men. And from his hand they have proceeded against those who dwell on the earth from that day and for evermore." Therefore, the fruit of the tree of knowledge of good and evil was flesh and the methods to acquire it.
Islamic tradition 
According to the Quran, Surah Al-A'raf 7:19 describes Adam and his wife in Paradise where they may eat what is provided, except that they may not eat from one particular tree, should they be considered Zalimun. Surah Ibrahim #.14:26 describes the forbidden tree as an evil tree that is forbidden for guidance.
Surah Al-A'raf 7:22 describes the ˈibliːs who misled them with deception, and then it was Adam who initiated eating from the forbidden tree. Then when they tasted of the tree, that which was hidden from them of their shame became manifest to them and they began to cover themselves with the leaves of Paradise. And their Lord called out to them: "Did I not forbid you that tree and tell you: Verily, Shaitân is an open enemy unto you?" (Quran 7:19). The Quran holds both Adam and his wife accountable for eating the forbidden fruit. As punishment, they were both banished from Heaven and sent to the Earth where they were forgiven after repenting.
See also 
- The Straight Dope: Was the forbidden fruit in the Garden of Eden an apple?
- The Fig: its History, Culture, and Curing, Gustavus A. Eisen, Washington, Govt. print. off., 1901
- High Art: Were Botticelli's Venus And Mars Stoned? : NPR
- Was the Forbidden Fruit Really an Apple? – Creation Revolution
- Berachos 40a; Sanhedrin 70a.
- Zohar Noah 73a
- The Zohar: The First Ever Unabridged English Translation, with Commentary (Rabbi Michael Berg, ed., Vol. 2, pp.388-390
- Bereishis Rabah 15:7
- Bereishis Rabah 19:5
- Berachos 40a; Sanhedrin 70a
- "Purdue New Crops Profile".
- William Dudley Gray (1973). The Use of Fungi as Food and in Food Processing, Part 2. CRC Press. p. 182. ISBN 0-8493-0118-1.
- "John Allegro, 65; Aided Deciphering of Dead Sea Scrolls", obit., NY Times
- John Marco Allegro: The Maverick of the Dead Sea Scrolls, by Judith Anne Brown, Wm. B. Eerdmans Publishing Company (1 March 2005), ISBN 978-0-8028-6333-1, pp. xii-xiii
- Allegro, John M. (1970). The Sacred Mushroom and The Cross: A study of the nature and origins of Christianity within the fertility cults of the ancient Near East. Garden City, New York: Doubleday., re-released in a new edition by Gnostic Media Research & Publishing in 2009
- Irvin, Jan (2009). "The Holy Mushroom: Evidence of Mushrooms in Judeo-Christianity: A critical re-evaluation of the schism between John M. Allegro and John R. Gordon Wasson over the theory on the entheogenic origins of Christianity presented in The Sacred Mushroom and the Cross." Gnostic Media Research and Publishing
- Ruck, Carl "Academic Endorsements for the Holy Mushroom"
- Quran 7:19: "And O Adam! Dwell you and your wife in Paradise, and eat thereof as you both wish, but approach not this tree otherwise you both will be of the Zâlimûn (unjust and wrong-doers)."
- Quran 14:26: "And the simlitude/parable (مۡثَالَ )of an evil word is that of an evil tree uprooted from the surface of earth having no stability."
- Dowling, Curtis F.; Morton, Julia Frances (1987). Fruits of warm climates. Miami, FL: J.F. Morton. ISBN 0-9610184-1-0. OCLC 16947184.