Rebel Angels. In Abrahamic religions, fallen angels are angels who were expelled from heaven.
   The literal term fallen angel appears neither in the Bible nor in other Abrahamic scriptures, but is used to describe angels who were cast out of heaven or angels who sinned. Such angels often tempt humans to sin.
   The idea of fallen angels derived from the Book of Enoch, a Jewish pseudepigraph, or the assumption that the sons of God mentioned in Genesis 6:1-4 are angels. In the period immediately preceding the composition of the New Testament, some sects of Judaism, as well as many Christian Church Fathers, identified the sons of God of Genesis 6:1-4 as fallen angels.
   Rabbinic Judaism and Christian authorities after the third century rejected the Enochian writings and the notion of an illicit union between angels and women producing giants. Christian doctrine states that the sins of fallen angels start before the beginning of human history.
   Accordingly, fallen angels became identified with angels who were led by Satan in rebellion against God and equated with demons. However, during the late Second Temple period, demons were not thought of as the fallen angels themselves, but as the surviving souls of their monstrous offspring. According to this interpretation, fallen angels have intercourse with human women, giving existence to the Biblical giants. To purge the world of these creatures, God sends t
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