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.And whatsoever is first ripe in the land,.... Of any other sort of fruit, figs, pomegranates, apples, plums, pears, &c. besides olives and vines:

which they shall bring unto the Lord, shall be thine; which they shall bring in a basket to the tabernacle, where it was, or to the temple, when built: this the priests were to have, see Deuteronomy 26:2,

everyone that is clean in thine house shall eat of it; See Gill on Numbers 18:11.