But he would also learn that the exemption which he did not possess by right (although a son of Abraham) he might obtain through grace. The goodness of God did not pronounce him safe, but it pointed out to him a way of salvation. He would scarcely observe, so entirely was it a matter of course, that this way must be of God’s appointment and not of his own invention—that if he devised much more costly, elaborate and imposing ceremonies to replace those which Moses taught him, he would perish like any Egyptian who devised nothing, but simply cowered under the shadow of the impending doom. Nor was the salvation without price. It was not a prayer nor a fast which bought it, but a life. The conviction that a redemption was necessary if God should be at once just and a justifier of the ungodly sprang neither from a later hairsplitting logic, nor from a methodising theological science; it really lay upon the very surface of this and every offering for sin, as distinguished from those offerings which expressed the gratitude of the accepted. We have not far to search for evidence that the lamb was really regarded as a substitute and ransom. The assertion is part and parcel of the narrative itself. For, in commemoration of this deliverance, every firstborn of Israel, whether of man or beast, was set apart unto the Lord. The words are, “Thou shall cause to PASS OVER unto the Lord all that openeth the womb, and every firstling which thou hast that cometh of a beast; the males shall be the Lord’s” (xiii. 12). What, then, should be done with the firstborn of a creature unfit for sacrifice? It should be replaced by a clean offering, and then it was said to be redeemed. Substitution or death was the inexorable rule. “Every firstborn of an ass thou shalt redeem with a lamb, and if thou wilt not redeem it, then thou shalt break its neck.” The meaning of this injunction is unmistakable. But it applies also to man: “All thy firstborn of man among thy sons thou shalt redeem.” And when their sons should ask “What meaneth this?” they were to explain that when Pharaoh hardened himself against letting them go from Egypt, “the Lord slew all the firstborn in the land; ... therefore I sacrifice to the Lord all that openeth the womb being males; but all the firstborn of my sons I redeem” (xiii. 12–15).