17 But the firstborn of a cow, or the firstborn of a sheep, or the firstborn of a goat, you shall not redeem; they are holy: you shall sprinkle their blood on the altar, and shall burn their fat for an offering made by fire, for a sweet savor to Yahweh.
He shall lay his hand on the head of his offering, and kill it at the door of the tent of meeting: and Aaron's sons the priests shall sprinkle the blood on the altar round about. He shall offer of the sacrifice of peace offerings an offering made by fire to Yahweh; the fat that covers the innards, and all the fat that is on the innards, and the two kidneys, and the fat that is on them, which is by the loins, and the cover on the liver, with the kidneys, he shall take away. Aaron's sons shall burn it on the altar on the burnt offering, which is on the wood that is on the fire: it is an offering made by fire, of a sweet savor to Yahweh.
All the firstborn males that are born of your herd and of your flock you shall sanctify to Yahweh your God: you shall do no work with the firstborn of your herd, nor shear the firstborn of your flock. You shall eat it before Yahweh your God year by year in the place which Yahweh shall choose, you and your household. If it have any blemish, [as if it be] lame or blind, any ill blemish whatever, you shall not sacrifice it to Yahweh your God. You shall eat it within your gates: 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.