John Calvin on Numbers 24:10-11

10. And Balak’s anger was kindled against Balaam. Inasmuch as the obstinacy of the wicked is not overcome, so that they should submit themselves to God, when He would bring their lusts under the yoke, it must needs be that, when they are still further pressed, they are carried away into passion. Thus now, Balak, after murmurings and expostulations, bursts forth into impetuous wrath, and rejects, and drives away with reproaches from his presence Balaam, whom he had hitherto been endeavoring to cajole. For, when he smites his hands together, it is because he can no longer restrain himself. He is especially indignant, because Balaam had not hesitated freely and openly to bear witness to the blessing of the children of Israel, against whom he was so full of hatred. For nothing is more galling to kings than when they see private individuals regarding their presence at least without alarm. Since he determines to give no reward to the untoward and ill-starred prophet, he throws the blame upon God, lest he should himself incur discredit from this, as if he were illiberal. And, indeed, what he says is true, that God had kept back Balaam from honor; yet impiously, and, as it were, reproachfully, does he lay the blame upon God, and, in fact, accuses Him of being the cause of the non-fulfillment of his promise.