Mark 10:8

Revised Standard Version

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

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Therefore a man leaves his father and his mother and cleaves to his wife, and they become one flesh.

What therefore God has joined together, let not man put asunder.”

Do you not know that he who joins himself to a prostitute becomes one body with her? For, as it is written, “The two shall become one flesh.”

Even so husbands should love their wives as their own bodies. He who loves his wife loves himself.