14 Every devoted thing in Israel shall be yours. 15 Everything that opens the womb of all flesh, whether man or beast, which they offer to the Lord, shall be yours; nevertheless the first-born of man you shall redeem, and the firstling of unclean beasts you shall redeem. 16 And their redemption price (at a month old you shall redeem them) you shall fix at five shekels in silver, according to the shekel of the sanctuary, which is twenty gerahs. 17 But the firstling of a cow, or the firstling of a sheep, or the firstling of a goat, you shall not redeem; they are holy. You shall sprinkle their blood upon the altar, and shall burn their fat as an offering by fire, a pleasing odor to the Lord; 18 but their flesh shall be yours, as the breast that is waved and as the right thigh are yours. 19 All the holy offerings which the people of Israel present to the Lord I give to you, and to your sons and daughters with you, as a perpetual due; it is a covenant of salt for ever before the Lord for you and for your offspring with you."
Matthew Henry's Commentary on Numbers 18:14-19
Commentary on Numbers 18:8-19
(Read Numbers 18:8-19)
All believers are spiritual priests, and God has promised to take care of them. Godliness has the promise of the life that now is. And from the provision here made for the priests, the apostle shows that it is the duty of christian churches to maintain their ministers. Scandalous maintenance makes scandalous ministers. The priests were to be wholly devoted to their ministry, not diverted from it, or disturbed in it, by worldly care or business. Also, that they might be examples of living by faith, not only in God's providence, but in his ordinances. The best should be offered for the first-fruits unto the Lord. Those who think to save, by putting God off with the refuse, deceive themselves, for God is not mocked.