If a man commits adultery with another man’s wife—with the wife of his neighbor—both the adulterer and the adulteress must surely be put to death.
Sins against the seventh commandment are here ordered to be severely punished. These are sins which, of all others, fools are most apt to make a mock at; but God would teach those the heinousness of the guilt by the extremity of the punishment that would not otherwise be taught it. I. Lying with another man's wife was made a capital crime.
Commenting on Leviticus 20:10-21
And the man that committeth adultery with another man's wife,.... Which is a breach of the seventh command, Exo 20:14, even he that committeth adultery with his neighbour's wife: which is only an explanation of the former clause; though the Jewish writers, as Jarchi and Ben Gersom, say this is so expressed to except the wife of a stranger, or a Gentile; but it means...
Committeth adultery - To what has been said in the note on See Exo 20:14 (note), we may add, that the word adultery comes from the Latin adulterium, which is compounded of ad, to or with, and alter, another, or, according to Minshieu, of ad alterius forum, he that approaches to another man's bed.