1 Enoch 19:1-3
Uriel reveals to Enoch that the spirits of fallen angels who mated with women will corrupt humanity by assuming various forms and leading them to wors...
1And Uriel said to me: "Here shall stand the spirits of the angels who mingled with women; and their spirits, taking many forms, shall defile humankind and lead them astray into sacrificing to demons as to gods, until the great day of judgment, on which they shall be judged, so that they are brought to an end.
2And the wives of the transgressing angels shall become sirens."
3And I, Enoch, alone saw the vision, the ends of all things; and no man shall see as I have seen.