Thy neighbor's wife - See Clarke's note on Exodus 20:14.

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.

"To a neighbour's wife thou shalt not give שׁכבתּך thy pouring as seed" (i.e., make her pregnant), "to defile thyself with her," viz., by the emissio seminis (Leviticus 15:16-17), a defilement which was to be punished as adultery by the stoning to death of both parties (Leviticus 20:10; Deuteronomy 22:22, cf. John 9:5).

Moreover thou shalt not lie carnally with thy neighbor's wife, to defile thyself with her.

18:1-30 Unlawful marriages and fleshly lusts. - Here is a law against all conformity to the corrupt usages of the heathen. Also laws against incest, against brutal lusts, and barbarous idolatries; and the enforcement of these laws from the ruin of the Canaanites. God here gives moral precepts. Close and constant adherence to God's ordinances is the most effectual preservative from gross sin. The grace of God only will secure us; that grace is to be expected only in the use of the means of grace. Nor does He ever leave any to their hearts' lusts, till they have left him and his services.