Deuteronomy 18:2-4

New Revised Standard Version, Anglicised Catholic Edition

² but they shall have no inheritance among the other members of the community; the Lord is their inheritance, as he promised them.

³ 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, the two jowls, and the stomach. ⁴ The first fruits of your grain, your wine, and your oil, as well as the first of the fleece of your sheep, you shall give him.