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Every firstling of an ass thou shalt redeem with a lamb - Or a kid, as in the margin. In Numbers 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, Numbers 18:8, Numbers 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 Deuteronomy 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 Genesis 20:16; (note). And for the shekel, see Clarke on Genesis 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 Numbers 3:12, Numbers 3:13, Numbers 3:41, Numbers 3:43, Numbers 3:45, Numbers 3:47-51.

An ass - The ass could not be offered in sacrifice, being an unclean animal: possibly the only unclean animal domesticated among the Israelites at the time of the Exodus. This principle was extended to every unclean beast; see Numbers 18:15.

Thou shalt redeem - The lamb, or sheep, was given to the priest for the service of the sanctuary.

Firstborn of man - The price of redemption was fixed at five shekels of the sanctuary: Numbers 3:47, where see the note.

The firstlings of beast not used in sacrifice, were to be changed for others so used, or they were to be destroyed. Our souls are forfeited to God's justice, and unless ransomed by the sacrifice of Christ, will certainly perish. These institutions would continually remind them of their duty, to love and serve the Lord. In like manner, baptism and the Lord's supper, if explained and attended to, would remind us, and give us occasion to remind one another of our profession and duty.