The Nephilim were on the earth in those days--and afterward as well--when the sons of God had relations with the daughters of men. And they bore them children who became the mighty men of old, men of renown.
Cross References
Genesis 11:4"Come," they said, "let us build for ourselves a city with a tower that reaches to the heavens, that we may make a name for ourselves and not be scattered over the face of all the earth."
Numbers 13:33We even saw the Nephilim there--the descendants of Anak that come from the Nephilim! We seemed like grasshoppers in our own sight, and we must have seemed the same to them!"
Treasury of Scripture
There were giants in the earth in those days; and also after that, when the sons of God came in to the daughters of men, and they bore children to them, the same became mighty men which were of old, men of renown.
giants.
Numbers 13:33
And there we saw the giants, the sons of Anak, which come of the giants: and we were in our own sight as grasshoppers, and so we were in their sight.
Deuteronomy 2:20,21
(That also was accounted a land of giants: giants dwelt therein in old time; and the Ammonites call them Zamzummims; …
Deuteronomy 3:11
For only Og king of Bashan remained of the remnant of giants; behold, his bedstead was a bedstead of iron; is it not in Rabbath of the children of Ammon? nine cubits was the length thereof, and four cubits the breadth of it, after the cubit of a man.
after.
Genesis 6:3
And the LORD said, My spirit shall not always strive with man, for that he also is flesh: yet his days shall be an hundred and twenty years.
men of.
Genesis 11:4
And they said, Go to, let us build us a city and a tower, whose top may reach unto heaven; and let us make us a name, lest we be scattered abroad upon the face of the whole earth.
Numbers 16:2
And they rose up before Moses, with certain of the children of Israel, two hundred and fifty princes of the assembly, famous in the congregation, men of renown: