Numbers 18:6-8

New Revised Standard Version Catholic Edition

⁶ It is I who now take your brother Levites from among the Israelites; they are now yours as a gift, dedicated to the Lord, to perform the service of the tent of meeting. ⁷ But you and your sons with you shall diligently perform your priestly duties in all that concerns the altar and the area behind the curtain. I give your priesthood as a gift;^[a] any outsider who approaches shall be put to death.

The Priests’ Portion

⁸ The Lord spoke to Aaron: I have given you charge of the offerings made to me, all the holy gifts of the Israelites; I have given them to you and your sons as a priestly portion due you in perpetuity.