Book of Enoch
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The Book of Enoch is an ancient Hebrew apocalyptic religious text, ascribed by tradition to the patriarch Enoch who was the father of Methuselah and the great-grandfather of Noah. The Book of Enoch contains unique material on the origins of demons and Nephilim, why some angels fell from heaven, an explanation of why the Genesis flood was morally necessary, and a prophetic exposition of the thousand-year reign of the Messiah. Three books are traditionally attributed to Enoch, including the distinct works 2 Enoch and 3 Enoch.
4th century AD manuscript, with the end of 'The Epistle of Enoch' and the beginning of the Passion homily of 'Melito'; note the large text reading ΕΠΙΣΤΟΛΗ ΕΝΩΧ (EPISTOLĒ ENOCH)
Fallen angel
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Fallen angels are angels who were expelled from Heaven. The literal term "fallen angel" does not appear in any Abrahamic religious texts, but is used to describe angels cast out of heaven or angels who sinned. Such angels often tempt humans to sin.
The Fallen Angels (1893), by Salvatore Albano. Brooklyn Museum, New York City
Fountain of the Fallen Angel (1877), by Ricardo Bellver. Retiro Park, Madrid, Spain
The Fall of the Rebel Angels (Apocryphal) (c. 1250), by William de Brailes. God sits on a throne within a mandorla. The rebelling angels are depicted as falling out of heaven and into a hell, in the shape of a mouth. As they fall, the angels become demons.