Exodus 13:8

8.And thou shalt shew thy son in that day. He repeats what we have already remarked, viz., an injunction to parents to teach their children, that they may thus transmit the service of God to their descendants. In the preceding chapter it was said, “when your children shall say unto you,” etc.; and now he more briefly commands that God’s goodness should be proclaimed, although none should make inquiry respecting it; because parents ought to be voluntarily disposed to educate their children in the fear of God. He also repeats, as we have seen above, that the memory of their deliverance should be annually renewed lest it should ever fade away, since religion is easily neglected unless men are diligently exercised in its study, tie uses a comparison when he says, “it shall be for a sign unto thee upon thine hand, and for a memorial between thine eyes;” as though it had been said that their redemption should be set before their eyes in the passover, just as the ring which is on the finger, or the ornament which is bound upon the forehead are constantly seen. For which purpose also he had before desired that the precepts of the Law should be inscribed both on the head, and on the hands, and fringes of their garments. The sum is, that in the passover a monument of God’s grace should exist, so that it might never sink into oblivion; just as ornaments which appear on the forehead and on the fingers awaken the attention by their being constantly beheld. But, if any should rather be of opinion that Moses alludes to those who, conscious of their own faithlessness, contrive means to assist their memory, (323) I offer them no opposition; as if he had said that, since they were disposed to forgetfulness, they should use this remedy, to awaken themselves to gratitude. He will soon afterwards repeat the same injunction, in connection with the offering of the first-born. The following words, “that the Lord’s Law may be in thy mouth,” confirm the opinion that the passover has reference to the First Commandment. They intimate that it is not enough to perform the external rite, unless it be associated with its proper object, viz., that they should devote themselves to God and to His doctrine. He mentions the mouth, not because the main thing is, to speak or discourse of the Law, for if piety lay in the tongue, hypocrites would be the best worshippers of God; but he expressly requires that, when each one shall have privately applied himself to the study of the Law, they shall also mutually teach and exhort each other.