One flesh in Genesis and Ephesians
Paul quotes the words spoken at the first marriage in Eden, then says that the mystery they carry is profound and that he is speaking about Christ and the church.
“For this reason a man will leave his father and mother and be united to his wife, and the two will become one flesh.” This mystery is profound, but I am speaking about Christ and the church.
Genesis 2:24 says that a man will leave his father and mother, be united to his wife, and become one flesh. Ephesians 5:31 quotes the sentence and verse 32 speaks of Christ and the church.