Commentaries
3:9-12 Zion's walls owe no thanks to those that build them up with blood and iniquity. The sin of man works not the righteousness of God. Even when men do that which in itself is good, but do it for filthy lucre, it becomes abomination both to God and man. Faith rests in the Lord as the soul's foundation: presumption only leans upon the Lord as a prop, and would use him to serve a turn. If men's having the Lord among them will not keep them from doing evil, it never can secure them from suffering evil for so doing. See the doom of wicked Jacob; Therefore shall Zion for your sake be ploughed as a field. This was exactly fulfilled at the destruction of Jerusalem by the Romans, and is so at this day. If sacred places are polluted by sin, they will be wasted and ruined by the judgments of God.
10. They—change of person from "ye" (Mic 3:9); the third person puts them to a greater distance as estranged from Him. It is, literally, "Whosoever builds," singular.
build up Zion with blood—build on it stately mansions with wealth obtained by the condemnation and murder of the innocent (Jer 22:13; Eze 22:27; Hab 2:12).