John Calvin's Bible Commentary
Numbers 31:14
14And Moses was wroth with the officers. A successful issue usually obtains pardon for any errors in performance, nay, in a manner covers them, so that they are not taken into account; but, although the army brought with it many causes of congratulation, still Moses does not forbear from severely reproving their single fault. By this example we are taught that, whilst we give praise to virtuous actions, we are not to approve of anything which deserves reprehension. The anger of Moses might appear to us inhumane, when he severely reproves his soldiers because they had not treated the female sex with the greatest cruelty; but it is not our business to canvass the judgments of God, before whose tribunal we must all hereafter stand. Although, therefore, they may be repugnant to our own feelings, still we must rest assured that, even where they may seem to be excessive, He nevertheless tempers the most severe punishments with the most perfect equity; yea, that although He may for a time overlook, or at any rate not so severely punish, the same sin in the Moabites which He sorely avenged upon the Midiantes, there is still a most just cause for this distinction, although it may be hidden in His own breast. It is not our part to murmur against Him, lest He should absolve Himself by condemning our blasphemous audacity and temerity.
The Israelites sinned, in that, when they were only the ministers of God’s vengeance, it rested not in their own discretion to relax any part of it. And this is worthy of observation, that those who are armed with the sword, must not go out of the way on either side one tittle, but faithfully execute whatever God prescribes. By the praise which: is given to the anger of Moses, the imagination of the Stoics is refuted, with whom indifference (207) ( ἀπάθεια) is the highest of virtues. But rather are we to labor that all our affections should proceed from a good motive, and that they should be kept under such restraint, that they may contain no ebullition of carnal passion, but that spiritual zeal may preside in them. Moses, however, gives the reason why the women were no more to be spared than the men, viz., because they had prostituted themselves in order to lay deadly snares for the Israelites. As regards the little ones, the same reasoa did not affect them, inasmuch as they were guilty of no crime; yet is it not doubtful but that God justly desired that the very name of this wicked and irrecoverable nation should be utterly blotted out; just as He afterwards gave over to destruction the nations of Canaan, together with their offspring. The question, however, arises by what means the women, who “had not known a man,” were to be distinguished from virgins. The Jews, according to their custom, invent a fable (208) in reply, whereas it is probable that the decision was only come to on the ground of their age.