11. And if it be any unclean beast. Moses now, in the second place, treats of brute animals; which God commands to be sacrificed to Him, if they are suitable for it, and does not suffer the vow to be altered. But if they be imperfect or unclean, He lays down the rule for their redemption. But the question here arises, How it can be allowable to vow what God had forbidden to be offered to Him, and so had prohibited from being brought into the temple, as being unclean? Surely if it had entered into any one’s mind to sacrifice an unclean animal, the superstition would be rejected, nay, there would be need of expiation. But here, in my opinion, another kind of offering is adverted to, which did not vitiate the sacrifices and service of God by being contrary to the injunctions of His Law. There was therefore nothing strange in His accepting such a vow, though He punishes its levity by a pecuniary fine. Besides, suppose a strong and well-tried horse was in danger, his master made a vow that if it were saved he would be bound to pay its price; and so also in the other cases. To vow was nothing else than to commit to God’s faithfulness and protection whatever they wished to be preserved. Hence the too great commonness of vows, which still it was necessary to discharge in some way, lest God’s sacred name should be exposed to ridicule. This estimation God left to the arbitration of the priest. But if an animal might be offered in sacrifice, no redemption was allowed; and if any one had substituted another animal, or paid the price of it, he was punished for his fraud, for both ( i.e., the animal, and its substitute or price) were consecrated to God. The estimation, which is imposed upon one who had vowed, is irreversible, since God simply commands the Israelites to stand by the judgment of the priest, and to abide by the taxation, as it is called, enjoined upon them as a fixed rule; and, besides, they were to add a fifth part, as an additional fine, to the price appointed by the priest.