Genesis 6:1-5

The Nephilim and the Daughters of Men

Now it happened, when men began to multiply on the face of the land, and daughters were born to them, 2 that the sons of God saw that the daughters of men were good in appearance; and they took wives for themselves, whomever they chose. 3 Then Yahweh said, “^aMy Spirit shall not ¹strive with man forever ²^bbecause he indeed is flesh; ³nevertheless his days shall be 120 years.” 4 The ^aNephilim were on the earth in those days, and also afterward, when the sons of God came in to the daughters of men, and they bore children to them. Those were the mighty men who were of old, men of renown.
5 Then Yahweh saw that the evil of man was great on the earth, and that ^aevery intent of the thoughts of his heart was only evil continually.