Genesis 6:2-4

21st Century King James Version

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

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

⁴ There were giants on the earth in those days; and also after that, when the sons of God came in unto the daughters of men and they bore children to them, the same became mighty men who were of old, men of renown.