Deuteronomy 18:2-4

New Catholic Bible

² They will have no inheritance among their brethren; the Lord is their inheritance, as he has promised them. ³ This is the portion due to the priest from the people who offer a sacrifice of either an ox or a sheep: the shoulder, the jowl, and the inner organs. ⁴ You will give them the firstfruits of the grain, the wine, and the oil, as well as the first sheering of the sheep