19 All the heave offerings of the holy things, which the children of Israel offer unto the LORD, have I given thee, and thy sons and thy daughters with thee, by a statute for ever: it is a covenant of salt for ever before the LORD unto thee and to thy seed with thee.
Then it shall be, that, when ye eat of the bread of the land, ye shall offer up an heave offering unto the LORD. Ye shall offer up a cake of the first of your dough for an heave offering: as ye do the heave offering of the threshingfloor, so shall ye heave it. Of the first of your dough ye shall give unto the LORD an heave offering in your generations.
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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.