cleave: Προσκολληθησεται: strong:G4347, "shall be cemented to his wife," as the Hebrew davak implies; a beautiful metaphor, forcibly intimating that nothing but death can separate them. Genesis 34:3; Deuteronomy 4:4, Deuteronomy 10:20, Deuteronomy 11:22; 1 Samuel 18:1; 2 Samuel 1:26; 1 Kings 11:2; Psalms 63:8; Romans 12:9
and they: 1 Corinthians 6:16, 1 Corinthians 7:2, 1 Corinthians 7:4