2 But they don't get land-inheritance like the rest of their kinsmen. God is their inheritance. 3 This is what the priests get from the people from any offering of an ox or a sheep: the shoulder, the two cheeks, and the stomach. 4 You must also give them the firstfruits of your grain, wine, and oil and the first fleece of your sheep, 5 because God, your God, has chosen only them and their children out of all your tribes to be present and serve always in the name of God, your God.

Matthew Henry's Commentary on Deuteronomy 18:2-5

Commentary on Deuteronomy 18:1-8

(Read Deuteronomy 18:1-8)

Care is taken that the priests entangle not themselves with the affairs of this life, nor enrich themselves with the wealth of this world; they have better things to mind. Care is likewise taken that they want not the comforts and conveniences of this life. The people must provide for them. He that has the benefit of solemn religious assemblies, ought to give help for the comfortable support of those that minister in such assemblies.