Numbers 23:2

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 were 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)