Proverbs 6:32 in the King James Version
But whoso committeth adultery with a woman lacketh understanding: he that doeth it destroyeth his own soul.
Context
31 but if he is found, he shall restore seven times. He shall give all the wealth of his house.
32 He who commits adultery with a woman is void of understanding. He who does it destroys his own soul.
33 He will get wounds and dishonor. His reproach will not be wiped away.