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Second Temple Judaism

The sources of demonic influence were thought to originate from the Watchers or Nephilim, who are first mentioned in Genesis 6 and are the focus of 1 Enoch Chapters 1–16, and also in Jubilees 10. The Nephilim were seen as the source of the sin and evil on Earth because they are referenced in Genesis 6:4 before the story of the Flood. In Genesis 6:5, God sees evil in the hearts of men. Ethiopic Enoch refers to Genesis 6:4–5, and provides further description of the story connecting the Nephilim to the corruption of humans. According to the Book of Enoch, sin originates when angels descend from heaven and fornicate with women, birthing giants. The Book of Enoch shows that these fallen angels can lead humans to sin through direct interaction or through providing forbidden knowledge. Most scholars understand the text, that demons originate from the evil spirits of the deceased giants, cursed by God to wander the Earth. Dale Martin disagrees with this interpretation, arguing that the ghosts of the Nephilim are distinct. The evil spirits would make the people sacrifice to the demons, but they were not demons themselves. The spirits are stated in Enoch to "corrupt, fall, be excited, and fall upon the earth, and cause sorrow".

The Book of Jubilees conveys that sin occurs when Cainan accidentally transcribes astrological knowledge used by the Watchers. This differs from Enoch in that it does not place blame on the angels. However, in Jubilees 10:4 the evil spirits of the Watchers are discussed as evil and still remain on Earth to corrupt humans. God binds only 90% of the Watchers and destroys them, leaving 10% to be ruled by Mastema. Because the evil in humans is great, only 10% would be needed to corrupt and lead humans astray. These spirits of the giants are also referred to as "the bastards" in the apotropaic prayer Songs of the Sage, which lists the names of demons the narrator hopes to expel.

To the Qumran community during the Second Temple period, this apotropaic prayer was assigned, stating: "And, I the Sage, declare the grandeur of his radiance in order to frighten and terri all the spirits of the ravaging angels and the bastard spirits, demons, Liliths, owls" (Dead Sea Scrolls, "Songs of the Sage", Lines 4–5).