Numbers 18:6-7
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6Behold, I Myself have taken your fellow Levites from among the sons of Israel; they are a gift to you, dedicated to the Lord, to perform the service for the tent of meeting. 7But you and your sons with you shall attend to your priesthood for everything that concerns the altar and inside the veil, and you are to perform service. I am giving you the priesthood as a service that is a gift, and the unauthorized person who comes near shall be put to death.”