“The Nephilim were on the earth in those days–and also afterward–when the sons of God went to the daughters of men and had children by them. They were heroes of old, men of renown.”
Do you know what a Nephilim is? In Hebrew, it literally means “the fallen ones” (or equivalently “those who have fallen”), but is translated into greek from “gigantes” to either giants or “earth born”, doesn’t make another reappearance until the book of numbers:
“We saw the Nephilim there (the descendents of Anak come from the Nephilim). We seemed like grasshoppers in our own eyes, and we looked the same to them.”
In context there, this is when Moses and his people have just scouted out the promised land and basically are like “Yeah, the land’s great, its abundant with food–its the land of milk and honey–but umm, one small problem there’s giants there, lets just forget it, this whole promised land thing just isn’t worth if it if we have to deal with giants”
And there’s other references of Anak’s descendants and stuff, but the Nephilim are only directly mentioned twice in the entire bible, elusive like Melchizedek.