And Balak did as Balaam had spoken; and Balak and Balaam offered on every altar a bullock and a ram.
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George Leo Haydock
Altar. They both join in sacrificing to Chamos or the devil, whom Balaam styles his lord, Yehovah: but the true God was pleased to hinder the idol from interfering at present, and answered Balaam, in order that he might see the folly of his conduct, and repent; and that others, who are more willing to listen to him, than to the servants of God, might be instructed by his declaration. (Haydock)
"God's voice is heard sounding from a profane mouth. "(St. Jerome, de 42. mans.) (Worthington)