Genesis 6:1–4
When man began to multiply on the face of the land and daughters were born to them, the sons of God saw that the daughters of man were attractive. And they took as their wives any they chose. Then the Lord said, “My Spirit shall not abide in man forever, for he is flesh: his days shall be 120 years.” The Nephilim were on the earth in those days, and also afterward, when the sons of God came in to the daughters of man and they bore children to them. These were the mighty men who were of old, the men of renown.
Many good Bible teachers and scholars do take the view that the reference to “angels who did not keep their own domain” is a reference to that group of fallen angels whom Satan persuaded to cohabit with women (Gen. 6:1-4) and who were confined immediately because of the gross nature of that sin. Another passage that may apply here is 2 Pet. 2:4-5 which says “For if God did not spare angels when they sinned, but cast them into hell and committed them to pits of darkness, reserved for judgment; and did not spare the ancient world, but preserved Noah, a preacher of righteousness, with seven others, when He brought a flood upon the world of the ungodly.” Some believe these are the fallen angels who sinned grievously by cohabiting with women, as described in Gen. 6:1-4 (see Jude 6).
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