Genesis 6:3-5

New Revised Standard Version, Anglicised

³ Then the Lord said, ‘My spirit shall not abide^[a] in mortals for ever, for they are flesh; their days shall be one hundred and twenty years.’ ⁴ The Nephilim were on the earth in those days—and also afterwards—when the sons of God went in to the daughters of humans, who bore children to them. These were the heroes that were of old, warriors of renown.

⁵ The Lord saw that the wickedness of humankind was great in the earth, and that every inclination of the thoughts of their hearts was only evil continually.