8 And the Lord said to Aaron, See, I have given into your care my lifted offerings; even all the holy things of the children of Israel I have given to you and to your sons as your right for ever, because you have been marked with the holy oil. 9 This is to be yours of the most holy things, out of the fire offerings; every offering of theirs, every meal offering and sin-offering, and every offering which they make on account of error, is to be most holy for you and your sons. 10 As most holy things they are to be your food: let every male have them for food; it is to be holy to you. 11 And this is yours: the lifted offering which they give and all the wave offerings of the children of Israel I have given to you and to your sons and to your daughters as your right for ever: everyone in your house who is clean may have them for food. 12 All the best of the oil and the wine and the grain, the first-fruits of them which they give to the Lord, to you have I given them. 13 The earliest produce from their land which they take to the Lord is to be yours; everyone in your house who is clean may have it for his food. 14 Everything given by oath to the Lord in Israel is to be yours.
Matthew Henry's Commentary on Numbers 18:8-14
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.