19. And do ye abide without the camp seven days. We have elsewhere seen, (209) that, if any one had touched a dead body, he was accounted unclean. Moses, by now extending the ceremony of expiation to lawful homicide, intimates how carefully we ought to abstain from shedding human blood. It was required of the Israelites that they should strenuously advance through the midst of carnage; but, inasmuch as it is in a manner contrary to the order of nature that men should be killed by men, as if they were raging against their own bowels, God would have some vestiges of humanity preserved even in just punishments, so as to put a restraint upon all cruelty in the abstract. Nor is it without cause that Scripture, even in commending heroic bravery, uses this form of expression, that “they have polluted their hands with blood,” who have slain any of their enemies, i.e., in order that we may abhor all acts of homicide, as being repugnant to the preservation of the human race. Although, therefore, the Israelites had slain the Midianites not only justly, but by God’s command, still, lest they should accustom themselves to the indiscriminate shedding of blood, they are commanded to purify themselves on the third and the seventh day, before they returned to the camp, so that their pollution should not infect the people. The reason for purifying the booty was different, viz., because the uncleanness of their vessels indicated how detestable was this people, whose very utensils, until they were purified either by fire or water, defiled every one by the mere touch. Lest, however, the soldiers should refuse to obey, or should comply unwillingly, Eleazar reminds them that nothing more was required of them than the observance of an old injunction. Nor is it to be doubted but that Moses designedly resigned the office of teaching to his nephew, because the interpretation of the law was hereafter to be sought from the mouth of the priest
(209) See ante, on Numbers 19:11, vol. 2, p. 42.