If a man is found lying with another man’s wife, both the man who slept with her and the woman must die. You must purge the evil from Israel.
Deuteronomy 22:22. If a man be found lying with. A Political Supplement, whereby it appears how greatly God abominates adultery, since He denounces capital punishment against it. And assuredly, since marriage is a covenant consecrated by God, its profanation is in no wise tolerable; and conjugal faith should be held too sacred to be violated with impunity, whilst it is an act of horrible perfidiousness...
These laws relate to the seventh commandment, laying a restraint by laying a penalty upon those fleshly lusts which war against the soul. I. If a man, lusting after another woman, to get rid of his wife slander her and falsely accuse her, as not having the virginity she pretended to when he married her, upon the disproof of his slander he must be punished, Deu 22:13-19.
Commenting on Deuteronomy 22:13-30
If a damsel that is a virgin be betrothed unto an husband,.... But not married, not as yet brought home to her husband's house, and the marriage consummated; for the Jews distinguish between being betrothed or espoused, and married; and generally there was some time between the one and the other.