Deuteronomy 22:21-22

21they will bring the woman to the door of her father’s house, and the men of her city will stone her to death. For she has committed an outrage in Israel by being promiscuous while living in her father’s house. You must purge the evil from you.

22“If a man is discovered having sexual relations with another man’s wife, both the man who had sex with the woman and the woman must die. You must purge the evil from Israel.