Mark 10:8

New International Version

and the two will become one flesh.’ So they are no longer two, but one flesh.

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That is why a man leaves his father and mother and is united to his wife, and they become one flesh.

Therefore what God has joined together, let no one separate.”

Do you not know that he who unites himself with a prostitute is one with her in body? For it is said, “The two will become one flesh.”

In this same way, husbands ought to love their wives as their own bodies. He who loves his wife loves himself.