Genesis 6:1-3

1Now it came to pass, when men began to multiply on the face of the earth, and daughters were born to them,

2that the sons of God saw the daughters of men, that they were beautiful; and they took wives for themselves of all whom they chose.

3And the Lord said, “My Spirit shall not strive with man forever, for he is indeed flesh; yet his days shall be one hundred and twenty years.”