It is an undeniable yet unspoken reality that the Bible references by Giant throughout the book. We start off initially with Genesis and this quote is probably one of the strongest foundations for belief and Giants that we see in modern belief systems. So specifically Genesis chapter 6 verse 4 which we will include below but it does make a very clear reference to hybrid humans and Giants or Nephilim as they were called. Of course then we see in the book of numbers that they also mentioned Giants the descendants of anak came from Giants who were like grasshoppers in our own sight and so were we in their site so talking about the size difference between humans. Then of course Nimrod who is reference in the Old Testament was a giant and in the Book of Numbers we see a reference to King Og also a giant.
Gen. 6: 4 There were giants in the earth in those days; and also after that, when the sons of God came in unto the daughters of men, and they bare children to them, the same became mighty men which were of old, men of renown. (Greek gods of mythology?