Here we have,

I.Further directions concerning the dedicating of their firstborn to God. 1. The firstlings of their cattle were to be dedicated to God, as part of their possessions. Those of clean beasts - calves, lambs, and kids - if males, were to be sacrificed, Exo 22:30; Num 18:17, Num 18:18. Those of unclean beasts, as colts, were to be redeemed with a lamb, or knocked on the head. For whatsoever is unclean (as we all are by nature), if it be not redeemed, will be destroyed, Exo 13:11, Exo 13:13. 2. The firstborn of their children were to be redeemed, and by no means sacrificed, as the Gentiles sacrificed their children to Moloch. The price of the redemption of the firstborn was fixed by the law (Num 18:16) at five sheckles. We were all obnoxious to the wrath and curse of God; by the blood of Christ we are redeemed, that we may be joined to the church of the firstborn. They were to redeem their children, as well as the firstlings of the unclean beasts, for our children are by nature polluted. Who can bring a clean thing out of an unclean?

II.Further directions concerning the catechising of their children, and all those of the rising generation, from time to time, in this matter. It is supposed that, when they saw all the firstlings thus devoted, they would ask the meaning of it, and their parents and teachers must tell them (Exo 13:14-16) that God's special propriety in their firstborn, and all their firstlings, was founded in his special preservation of them from the sword of the destroying angel. Being thus delivered, they must serve him. Note, 1. Children should be directed and encouraged to ask their parents questions concerning the things of God, a practice which would be perhaps of all others the most profitable way of catechising; and parents must furnish themselves with useful knowledge, that they may be ready always to give an answer to their enquiries. If ever the knowledge of God cover the earth, as the waters do the sea, the fountains of family-instruction must first be broken up. 2. We should all be able to show cause for what we do in religion. As sacraments are sanctified by the word, so they must be explained and understood by it. God's service is reasonable, and it is then acceptable when we perform it intelligently, knowing what we do and why we do it. 3. It must be observed how often it is said in this chapter that by strength of hand (Exo 13:3, Exo 13:14, Exo 13:16), with a strong hand (Exo 13:9), the Lord brought them out of Egypt. The more opposition is given to the accomplishment of God's purposes the more is his power magnified therein. It is a strong hand that conquers hard hearts. Sometimes God is said to work deliverance not by might nor power (Zac 4:6), not by such visible displays of his power as that recorded here. 4. Their posterity that should be born in Canaan are directed to say, The Lord brought us out of Egypt, Exo 13:14, Exo 13:16. Mercies to our fathers are mercies to us; we reap the benefit of them, and therefore must keep up a grateful remembrance of them. We stand upon the bottom of former deliverances, and were in the loins of our ancestors when they were delivered. Much more reason have we to say that in the death and resurrection of Jesus Christ we were redeemed.

Every firstling of an ass thou shalt redeem with a lamb - Or a kid, as in the margin. In Num 18:15, it is said: "The first-born of man shalt thou surely redeem; and the firstling of an unclean beast shalt thou redeem." Hence we may infer that ass is put here for any unclean beast, or for unclean beasts in general. The lamb was to be given to the Lord, that is, to his priest, Num 18:8, Num 18:15. And then the owner of the ass might use it for his own service, which without this redemption he could not do; see Deu 15:19.

The first-born of man - shalt thou redeem - This was done by giving to the priests five standard shekels, or shekels of the sanctuary, every shekel weighing twenty gerahs. What the gerah was, see Clarke on Gen 20:16 (note). And for the shekel, see Clarke on Gen 20:16 (note).

It may be necessary to observe here that the Hebrew doctors teach, that if a father had neglected or refused thus to redeem his first-born, the son himself was obliged to do it when he came of age. As this redeeming of the first-born was instituted in consequence of sparing the first-born of the Israelites, when the first-born both of man and beast among the Egyptians was destroyed, on this ground all the first-born were the Lord's, and should have been employed in his service; but he permitted the first-born of a useful unclean animal to be redeemed by a clean animal of much less value. And he chose the tribe of Levi in place of all the first-born of the tribes in general; and the five shekels were ordered to be paid in lieu of such first-born sons as were liable to serve in the sanctuary, and the money was applied to the support of the priests and Levites. See this subject at large in Num 3:12, Num 3:13, Num 3:41, Num 3:43, Num 3:45, Num 3:47-51.

And it came to pass, when Pharaoh would hardly let us go,.... Showed great reluctance to it, and with difficulty was prevailed upon to dismiss them:

that the Lord slew all the firstborn in the land of Egypt, both the firstborn of men, and the firstborn of beast: which he did in one night, making use of a destroying angel or angels for that purpose:

therefore I sacrifice to the Lord all that openeth thee matrix, being males; that is, the firstborn of all clean creatures, as oxen, sheep, and goats:

but all the firstborn of my children I redeem; by paying five shekels apiece to the priest for them, as before observed; and this law continues to be observed with the Jews; the manner of which, as related by Leo Modena (i), is as follows,"Thirty days being expired after the birth of the child, they call a priest to them; that is to say, one that is descended of the stock of Aaron, whom the father of the child pleaseth; and so, many people being gathered together at the time appointed, the father of the child bringeth before the priest, in a bowl or basin, a good quantity of gold and silver, and then they give him the child into his arms; the priest then calling the mother of it before him, saith unto her, mistress, is this your son? she answereth, yes; then, replies he, have you never had any child before, either male or female, or have miscarried anyone? she saith unto him, no; then doth the priest say, this child is mine, as being the firstborn; then turning himself toward the father, he asketh him, whether he will redeem it or not? who answereth him, saying, see, here is gold and silver, take your own price; then saith the priest unto him, you will redeem it then? the father answereth, I will redeem it; it shall be so then, saith the priest, this child is mine as being the firstborn, as it is written, Num 18:16. I therefore take this in exchange, &c. and so he takes the sum of two French crowns, or thereabout, as he thinks good, and then delivers the child to his father and mother, and this day they make a feasting day.''This custom was used in Christ's time, and was observed with respect to him, Luk 2:27.

(i) History of the Jews, par. 4. c. 9. sect. 2.

FIRSTLINGS OF BEASTS. (Exo 13:11-16)

every firstling, &c.--the injunction respecting the consecration of the first-born, as here repeated, with some additional circumstances. The firstlings of clean beasts, such as lambs, kids, and calves, if males, were to be devoted to God and employed in sacrifice. Those unclean beasts, as the ass's colt, being unfit for sacrifice, were to be redeemed (Num 18:15).