Genesis

¹And it came to pass, when men began to multiply on the face of the ground, and daughters were born unto them, ²that the sons of God saw the daughters of men that they were fair; and they took them wives of all that they chose. ³And the Lord said, My spirit shall not strive with man for ever, for that he also is flesh: yet shall his days be an hundred and twenty years. ⁴The Nephilim were in the earth in those days, and also after that, when the sons of God came in unto the daughters of men, and they bare children to them: the same were the mighty men which were of old, the men of renown. ⁵And 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. ⁶And it repented the Lord that he had made man on the earth, and it grieved him at his heart. ⁷And the Lord said, I will destroy man whom I have created from the face of the ground; both man, and beast, and creeping thing, and fowl of the air; for it repeateth me that I have made them.