Genesis 6:2-4

New Revised Standard Version, Anglicised

² the sons of God saw that they were fair; and they took wives for themselves of all that they chose. ³ Then the Lord said, ‘My spirit shall not abide^[a] in mortals for ever, for they are flesh; their days shall be one hundred and twenty years.’ ⁴ The Nephilim were on the earth in those days—and also afterwards—when the sons of God went in to the daughters of humans, who bore children to them. These were the heroes that were of old, warriors of renown.