Genesis 6:2-4

Divine beings found them very appealing, so they took the women they wanted as their wives. YAHWEH said, “My Spirit will not strive with humanity indefinitely, for they are mortal. Their life span will be shortened to only one hundred and twenty years.” Back then, and later, there were giants on the earth, who were born as a result of the unholy union of heavenly beings with the human daughters. They were the mighty ones of old, warriors of renown.