Proverbs 6:32
"But whoso committeth adultery with a woman lacketh understanding: he that doeth it destroyeth his own soul."
Cross References (ranked by relevance)
And beheld among the simple ones, I discerned among the youths, a young man void of understanding,
Marriage is honourable in all, and the bed undefiled: but whoremongers and adulterers God will judge.
And Pharaoh said unto Joseph, Forasmuch as God hath shewed thee all this, there is none so discreet and wise as thou art:
Thou shalt not commit adultery.
Hear now this, O foolish people, and without understanding; which have eyes, and see not; which have ears, and hear not:
They were as fed horses in the morning: every one neighed after his neighbour’s wife.
Whoso is simple, let him turn in hither: as for him that wanteth understanding, she saith to him,
But he that sinneth against me wrongeth his own soul: all they that hate me love death.
Cast away from you all your transgressions, whereby ye have transgressed; and make you a new heart and a new spirit: for why will ye die, O house of Israel?
O Israel, thou hast destroyed thyself; but in me is thine help.