Charles Ellicott Commentary Numbers 31:8

"And they slew the kings of Midian with the rest of their slain: Evi, and Rekem, and Zur, and Hur, and Reba, the five kings of Midian: Balaam also the son of Beor they slew with the sword." — Numbers 31:8 (ASV)

And they slew the kings of Midian ... — Those persons who are here described as kings appear to have been chiefs of the more powerful Midianite tribes, just as Zur is represented in Numbers 25:15. They are described in Joshua 13:21 as “princes” or “chiefs,” and as “dukes” or “princes” of Sihon, by which expression it appears that they were his vassals.

Balaam also the son of Beor they slew with the sword.— The death of Balaam by the sword of the Israelites presents a strange and instructive contrast to the prayer which he uttered that he might die the death of the righteous (Numbers 23:10).

Few of the ancient prophecies are more remarkable, as Bishop Wordsworth has observed, than those of Balaam for “spirituality of conception and sublimity of expression.”

And if, as some think, we are to understand Micah 6:8 as containing the actual words which were addressed by Balaam to Balak, few men possessed a clearer perception of moral truth than that which is expressed in the words, He hath shewed thee, O man, what is good; and what doth the Lord require of thee, but to do justly, and to love mercy, and to walk humbly with thy God?

And yet, notwithstanding the light which Balaam possessed, the sublimity of the prophecies which he uttered, and the purity of the motives by which he professed to be motivated, he loved the wages of unrighteousness and gave himself up to do Satan’s bidding in casting a stumbling-block before the children of Israel, and miserably perished among the enemies of God and of His people.

Bishop Wordsworth draws a striking and instructive contrast between Balaam and Moses, both of whom had visions of Christ and prophesied of Him, while one loved the wages of unrighteousness, and the other did all for God’s glory.