Genesis 6:1-5

The Corruption of Mankind

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 Jehovah said, My spirit shall not strive with man for ever, for that he also is flesh: yet shall his days be a hundred and twenty years. ⁴The Nephilim were in the earth in those days, and also after that, when the sons of God came unto the daughters of men, and they bare children to them: the same were the mighty men that were of old, the men of renown.

⁵And Jehovah 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.