“1) And all of them [the fallen Watchers] together went and took wives for themselves, each choosing one for himself, and they began to go into them and defile themselves with sex with them,
2) And the angels taught them charms and spells, and the cutting of roots, and made them acquainted with plants.
3) And the women became pregnant, and they bare large giants, whose height was 3000 ells.
4) The giants consumed all the work and toil of men. And when men could no longer sustain them, the giants turned against them and devoured mankind.”
(1 Enoch 7:1-4)