Deuteronomy 22:22-24

22“1If a man is found lying with a married woman, then both of them shall die, the man who lay with the woman, and the woman; thus you shall purge the evil from Israel.

23“2If there is a girl who is a virgin engaged to a man, and another man finds her in the city and lies with her, 24then you shall bring them both out to the gate of that city and you shall stone them 3to death; the girl, because she did not cry out in the city, and the man, because he has violated his neighbor’s wife. Thus you shall purge the evil from among you.