Leviticus 18:20

Moreover, thou shalt not lie carnally with thy neighbour's
wife
Which is adultery, and a breach of the seventh command, ( Exodus 20:14 ) : to defile thyself with her;
not only adultery is a defiling a man's wife, as it is sometimes called, but the adulterer defiles himself: all sin is of a defiling nature, but especially this, which defiles a man both in soul and body, and brings a blot and stain upon his character, which shall not be wiped off, ( Proverbs 6:32 Proverbs 6:33 ) .