Genesis 6:1-5

1 The Flood
When men began to increase in number on the earth and daughters were born to them,

2 the sons of God saw that the daughters of men were beautiful, and they married any of them they chose.

3 Then the Lord said, “My Spirit will not contend with man forever, for he is mortal; his days will be a hundred and twenty years.”

4 The Nephilim were on the earth in those days—and also afterward—when the sons of God went to the daughters of men and had children by them. They were the heroes of old, men of renown.

5 The Lord saw how great man’s wickedness on the earth had become, and that every inclination of the thoughts of his heart was only evil all the time.