17 But the firstborn of a cow, or the firstborn of a sheep, or the firstborn of a goat, thou shalt not ransom: they are holy. Thou shalt sprinkle their blood on the altar, and their fat shalt thou burn as an offering by fire for a sweet odour to Jehovah.
And he shall lay his hand on the head of his offering, and slaughter it at the entrance of the tent of meeting; and Aaron's sons, the priests, shall sprinkle the blood on the altar round about. And he shall present of the sacrifice of peace-offering an offering by fire to Jehovah; the fat that covereth the inwards, and all the fat that is on the inwards, and the two kidneys, and the fat that is on them, which is by the flanks, and the net above the liver which he shall take away as far as the kidneys; and Aaron's sons shall burn it on the altar upon the burnt-offering which [lieth] on the wood that is upon the fire: [it is] an offering by fire to Jehovah of a sweet odour.
Every firstling that is born among thy kine and among thy sheep that is a male, thou shalt hallow to Jehovah thy God: thou shalt do no work with the firstling of thy kine, nor shear the firstling of thy sheep. Thou shalt eat it before Jehovah thy God, year by year, in the place which Jehovah will choose, thou and thy household. But if there be a defect therein, [if it be] lame, or blind, [or have] any evil defect, thou shalt not sacrifice it to Jehovah thy God. In thy gates shalt thou eat it; the unclean and the clean [shall eat it] alike, as the gazelle and as the hart.
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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.