15 Everything that breaketh open the womb of all flesh, which they present to Jehovah, of men or of beasts, shall be thine; nevertheless the firstborn of man shalt thou in any case ransom, and the firstborn of unclean beasts shalt thou ransom.
that thou shalt offer unto Jehovah all that breaketh open the womb, and every firstling that cometh of cattle which is thine: the males [shall be] Jehovah's. And every firstling of an ass shalt thou ransom with a lamb; and if thou do not ransom it, thou shalt break its neck; and every firstborn of a man among thy sons shalt thou ransom.
Only the firstling which is offered as firstling to Jehovah among the cattle, that shall no man hallow, whether it be ox or sheep; it is Jehovah's. But if it be of an unclean beast, then he shall ransom it according to thy valuation, and shall add a fifth of it thereto; and if it be not redeemed, it shall be sold according to thy valuation.
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Commentary on Numbers 18 Matthew Henry Commentary
Chapter 18
Aaron being now fully established in the priesthood abundantly to his own satisfaction, and to the satisfaction of the people (which was the good that God brought out of the evil opposition made to him), in this chapter God gives him full instructions concerning his office or rather repeats those which he had before given him. He tells him,
Num 18:1-7
The coherence of this chapter with that foregoing is very observable.
Num 18:8-19
The priest's service is called a warfare; and who goes a warfare at his own charges? As they were well employed, so they were well provided for, and well paid. None shall serve God for nought. All believers are spiritual priests, and God has promised to take care of them; they shall dwell in the land, and verily they shall be fed, and shall not want any good thing. Godliness has the promise of the life that now is. And from this plentiful provision here made for the priests the apostle infers that it is the duty of Christian churches to maintain their ministers; those that served at the altar lived upon the altar. So those that preach the gospel should live upon the gospel, and live comfortably, 1 Co. 9:13, 14. Scandalous maintenance makes scandalous ministers. Now observe,
Num 18:20-32
Here is a further account of the provision that was made both for the Levites and for the priests, out of the country.