Proverbs 6:32 in the World English Bible
He who commits adultery with a woman is void of understanding. He who does it destroys his own soul.
Context
31 But if he be found, he shall restore sevenfold; he shall give all the substance of his house.
32 But whoso committeth adultery with a woman lacketh understanding: he that doeth it destroyeth his own soul.
33 A wound and dishonour shall he get; and his reproach shall not be wiped away.