Mark 10:8

New King James Version

and the two shall become one flesh’; so then they are no longer two, but one flesh.

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So husbands ought to love their own wives as their own bodies; he who loves his wife loves himself.

Therefore a man shall leave his father and mother and be joined to his wife, and they shall become one flesh.

Or do you not know that he who is joined to a harlot is one body with her? For “the two,” He says, “shall become one flesh.”

Therefore what God has joined together, let not man separate.”