Genesis 6.
The King James bible translated “Nephilim” into “Giants”.
(”Nephil” is a Hebrew verb that means “to fall”. The Hebrew suffix “im” denotes plurality. “Im” added to the verb “nephil” and it becomes a plural noun meaning “fallen ones”.)
Nephilim are mentioned several subsequent times in the Tenach (hebrew - Old Testament).
These hybrid humans were huge! Goliath was a Nephilim.
Lot of stuff on the webb dealing with this. I studied it for decades and it’s fascinating.
You see, I believe the Almighty is seriously, seriously into genetics.
I know I am. Especially when it comes to my rare & unknown heirloom tomatoes varieties. Those darn bees will cross pollinate the fruit which will deviate from the parent plant when I’m trying to save seeds for next year..!!
Seriously, go to youtube and search on Nephilim.
We are kinda like the Almighty’s tomato plants..
Hybrids are not allowed. :-)
See, that’s my point. It is not definitive one way or another. There is another interpretation where “the fallen” are actually the sons of Cain. Not of angels.
It’s not really defined in the Bible either way, but I’m OK with that. In reality, it’s not needed to be defined. It’s the overarching moral of the story - that even though some men were huge and physically strong and imposing, God could wipe them all out with a flood, and he could enable a small, young shepherd to beat them with just a rock.
It’s the lesson of the giants that matters, not that they might have come from angels or others.