Berĕshith (Genesis) 6:1-4

And it came to be, when men began to increase on the face of the earth, and daughters were born to them, that the sons of Elohim saw the daughters of men, that they were good. And they took wives for themselves of all whom they chose. And יהוה said, “My Spirit shall not strive with man forever in his going astray. He is flesh, and his days shall be one hundred and twenty years.” The Nephilim were on the earth in those days, and also afterward, when the sons of Elohim came in to the daughters of men and they bore children to them. Those were the mighty men who were of old, the men of name.