I. The author of Moab's destruction; it is the Lord of hosts, that has armies, all armies, at his command, and the God of Israel (v. 1), who will herein plead the cause of his Israel against a people that have always been vexatious to them, and will punish them now for the injuries done to Israel of old, though Israel was forbidden to meddle with them (Deut. ii. 9), therefore the destruction of Moab is called the work of the Lord (v. 10), for it is he that pleads for Israel; and his work will exactly agree with his word, v. 8.