Avenge the Lord What in the preceding verse is termed avenging Israel, is here called avenging the Lord, because by their idolatry and lewdness, and by seducing God's people into rebellion against him, they had offered a high affront to him. God's great care was to avenge the Israelites, and Moses's chief desire was to avenge God, rather than himself or the people.
Related Commentaries of Numbers 31:3
Numbers 31:3
3 And Moses spake unto the people, saying, Arm some of yourselves unto the war, and let them go against the Midianites, and avenge the LORD of Midian.