Genesis 6:4-6

Revised Standard Version Catholic Edition

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. ⁶ And the Lord was sorry that he had made man on the earth, and it grieved him to his heart.