(15) Have ye saved all the women alive?--It was the women, as is expressed in the following verse, who had been the cause, at the instigation of Balaam, of the apostacy of the Israelites; and consequently the command to "avenge the Lord of Midiani" implied the punishment of those who had been the instruments employed in the seduction of the Israelites.

31:13-18 The sword of war should spare women and children; but the sword of justice should know no distinction, but that of guilty or not guilty. This war was the execution of a righteous sentence upon a guilty nation, in which the women were the worst criminals. The female children were spared, who, being brought up among the Israelites, would not tempt them to idolatry. The whole history shows the hatefulness of sin, and the guilt of tempting others; it teaches us to avoid all occasions of evil, and to give no quarter to inward lusts. The women and children were not kept for sinful purposes, but for slaves, a custom every where practised in former times, as to captives. In the course of providence, when famine and plagues visit a nation for sin, children suffer in the common calamity. In this case parents are punished in their children; and for children dying before actual sin, full provision is made as to their eternal happiness, by the mercy of God in Christ.And Moses said unto them, have ye saved all the women alive? Which either had been reported to him, or he concluded, by seeing so many with them; and this question is put, not for information, but by way of reproof, and as chiding them for what they had done; for they might have received orders from him to put them to death, when he sent them out; and if so, there was the more reason to be angry with them; or he might conclude they would have done this of themselves, knowing what instruments of mischief these women had been to Israel.