John Wesley on Numbers 23:21

Iniquity - Not such as in the Canaanites: Such as he will punish with a curse, with utter destruction. The Lord is with him - He hath a favour for this people, and will defend and save them. The shout of a king - That is, such joyful and triumphant shouts as those wherewith a people congratulate the approach and presence of their King: when he appears among them upon some solemn occasion, or when he returns from battle with victory. This expression implies God's being their King and ruler, and their abundant security and confidence in him.