Genesis 6:3-5

Revised Standard Version Catholic Edition

³ Then the Lord said, “My spirit shall not abide in man for ever, for he is flesh, but his days shall be a hundred and twenty years.” ⁴ The Nephilim were on the earth in those days, and also afterward, when the sons of God came in to the daughters of men, and they bore children to them. These were the mighty men that were of old, the men of renown.

⁵ The Lord 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.