May not — This is the punishment of his levity and injustice in putting her away without sufficient cause, which by this offer he now acknowledgeth. Defiled — Not absolutely, as if her second marriage were a sin, but with respect to her first husband, to whom she is as a defiled or unclean woman, that is, forbidden things; forbidden are accounted and called unclean, Judges 13:7, because they may no more be touched or used than an unclean thing. Thou shalt not cause the land to sin — Thou shalt not suffer such lightness to be practised, lest the people be polluted, and the land defiled and accursed by that means.
Related Commentaries of Deuteronomy 24:4
Deuteronomy 24:4
4 Her former husband, which sent her away, may not take her again to be his wife, after that she is defiled; for that is abomination before the LORD: and thou shalt not cause the land to sin, which the LORD thy God giveth thee for an inheritance.