Deuteronomy 24:4

Her former husband may not take her again 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; for 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.