35. And they mingled with the nations and learned their deeds. 36. They worshipped their idols, which became a snare for them. 37. They slaughtered their sons and daughters to the demons [(shedim)]. 38. They shed innocent blood, the blood of their sons and daughters whom they slaughtered to the idols of Canaan, and the land became polluted with the blood. 39. And they became unclean through their deeds, and they went astray with their acts.
Tehillim (Psalms), 106.35-39
17. They sacrificed to demons [(shedim)], which have no power, deities they did not know, new things that only recently came, which your forefathers did not fear.
Devarim (Deuteronomy), 32.17
Shedim (Hebrew: שֵׁדִים; singular: שֵׁד Shed) are spirits or demons in the Tanakh and Jewish mythology. However, they are not necessarily equivalent to the modern connotation of demons as evil entities. Evil spirits were thought as the cause of maladies; conceptually differing from the shedim, who are not evil demigods, but the foreign gods themselves. Shedim are just evil in the sense that they are not God.
They appear only twice (always plural) in the Tanakh, at Psalm 106:37 and Deuteronomy 32:17. Both times it deals with child or animal sacrifices. Although the word is traditionally derived from the root ŠWD (Hebrew: שוד shûd) that conveys the meaning of "acting with violence" or "laying waste," it was possibly a loan-word from Akkadian in which the word shedu referred to a spirit which could be either protective or malevolent. With the translation of Hebrew texts into Greek, under influence of Zoroastrian dualism, shedim were translated into daimonia with implicit negativity. Otherwise, later in Judeo-Islamic culture, shedim became the Hebrew word for Jinn with a morally ambivalent attitude.
According to one legend, the shedim are descendants of serpents, or of demons in the form of serpents, alluding to the serpent in Eden as related in Genesis. According to one common view, they are the offspring of Lilith, from her union with Adam or other men. Another legend said that God created them on the sixth day, he had started making their bodies but did not complete their creation because he was resting during the Sabbath. Even after the Sabbath, he left them how they were to show that when the Sabbath comes, all work must be viewed as complete. Therefore, the shedim have souls like that of humans, but without a body.
In three ways they are like ministering angels: They have wings like ministering angels; and they fly from one end of the world to the other like ministering angels; and they know what will be in the future like ministering angels. And in three ways they are similar to humans: They eat and drink like humans; they multiply like humans; and they die like humans.
They can cause sickness and misfortune, follow the dead and fly around graves.
Supposedly, sinful people sacrificed their daughters to the shedim, but it is unclear if the sacrifice consisted in the murdering of the victims or in the sexual satisfaction of the demons.
There are many things that one is admonished not to do in order to avoid invoking the shedim, such as whistling or even saying the word "shedim". The 12th century mystic Judah ben Samuel of Regensburg wrote in his will and testament that one should not seal up windows completely because it traps shedim in the house.
Conjuring shedim isn't necessarily forbidden, depending on whether or not, author's view summoning them as sorcery or not. Even if summoning shedim is an act of sorcery and thus forbidden, consulting shedim conjured by a non-Jew would be permissible.(p179)
Shedim can shapeshift and assume a human form. The Talmud tells of Asmodeus assuming King Solomon's form and ruling in his place for some time. However, he was never seen barefoot because he could not disguise his feet.
In the Zohar:
The Shekhinah hid Esther from Ahasuerus and gave him a Shedah [a she-devil] instead while she returned to Mordechai's arms. [...] This is why a man must speak with his wife before he mates with her, because she might have been exchanged with a female demon.
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- The Complete Jewish Bible. Chabad.org.
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- The Encyclopedia of Demons and Demonology. Rosemary Guiley. Infobase Publishing, May 12, 2010. p. 21
- Zohar. 3:76b-77a.
- Babylonian Talmud. pp. Chagigah 16a.
- Maureen Bloom Jewish Mysticism and Magic: An Anthropological Perspective Routledge 2007 ISBN 978-1-134-10329-4 page 128
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- Heiser, Michael S. 2015. The Unseen Realm: Recovering the Supernatural Worldview of the Bible. 
- Koén-Sarano, Matilda. King Solomon and the Golden Fish: Tales from the Sephardic Tradition. Translated by Reginetta Haboucha. Wayne State University Press, 2004. Limited preview online.
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- Elyonim veTachtonim. An on-line database of angels, demons, ghosts and monsters in the Bible and Babylonian Talmud.