Rashi

Why does Rambam list these Mitzvoth thus? Is it because Exodus precedes Deuteronomy? This is not a good answer, for when studying Torah we should always favor the interpretation that draws us to Love Adonoy more intensely. Maybe Rambam is suggesting that coveting followed quickly by trying to buy your neighbor’s possessions is bad enough, but laying awake at night desiring and dreaming of your neighbor’s property is far worse. Coveting is perverse idolatry. Coveting counts here for coveting, the looking and the desiring, always precedes adultery. […]

The Mitzvah against coveting appears in slightly different form in Exodus and Deuteronomy. In Exodus you are forbidden to covet your neighbor’s house, and you are forbidden to covet his wife. In Deuteronomy you are forbidden to covet your neighbor’s wife, and are forbidden to desire his house. In Deuteronomy you cannot covet his field, and in both versions you cannot covet or desire his slaves, his ox, his donkey, or anything else that is his neighbor. If the tablets were written today, your neighbor’s car would probably be on the list. Ramban suggests that coveting your neighbor’s wife is listed first in Deuteronomy because it is the greatest sin of all. Coveting your neighbor’s husband is just as much a sin. […]