Deuteronomy 18:1-5

“The Levitical priests, all the tribe of Levi, shall have no portion or inheritance with Israel. They shall eat the LORD’s food offerings as their inheritance. They shall have no inheritance among their brothers; the LORD is their inheritance, as he promised them. And this shall be the priests’ due from the people, from those offering a sacrifice, whether an ox or a sheep: they shall give to the priest the shoulder and the two cheeks and the stomach. The firstfruits of your grain, of your wine and of your oil, and the first fleece of your sheep, you shall give him. For the LORD your God has chosen him out of all your tribes to stand and minister in the name of the LORD, him and his sons for all time.