Genesis 6
1 It happened, when men began to multiply on the surface of the ground, and daughters were born to them,
2 Ref that God's sons saw that men's daughters were beautiful, and they took for themselves wives of all that they chose.
3 Ref Yahweh said, "My Spirit will not strive with man forever, because he also is flesh; yet will his days be one hundred twenty years."
4 Ref The Nephilim were in the earth in those days, and also after that, when God's sons came to men's daughters. They bore children to them: the same were the mighty men who were of old, men of renown.
5 Ref Yahweh saw that the wickedness of man was great in the earth, and that every imagination of the thoughts of his heart was only evil continually.