 And the angels who did not keep their proper domain but deserted their own dwelling He has kept bound in everlasting chains under darkness for the judgment of the great day.. The phrase sons of God in Gen. 6:2,4 is a translation of the Hebrew phrase the only other places this phrase occurs are in Job 1:6, 2:1 and 38:7, where the reference is clearly to angelic beings. This was such a heinous crime that God incarcerated them millennia before the victory of Christ that would justify the procedure; that is what He went to announce, as mentioned in 1 Peter 3:19. It was also a master stroke by Satansince the male sperm transmits the human nature Hebrews 7:9-10, Romans 5:12 and determines the blood of any child, if Satan had succeeded in contaminating the whole race, the Messiah could not be born and Genesis 3:15 could not be fulfilled. 