Numbers 18:6-8

Complete Jewish Bible

⁶ I myself have taken your kinsmen the L’vi’im from among the people of Isra’el; they have been given as a gift to Adonai for you, so that you can perform the service in the tent of meeting. ⁷ You and your sons with you will exercise your prerogatives and duties as cohanim in regard to everything having to do with the altar and within the curtain. I entrust the service required of cohanim to you; the unauthorized person who tries to perform it is to be put to death.”

⁸ Adonai said to Aharon, “I myself have put you in charge of the contributions given to me. Everything consecrated by the people of Isra’el I have given and set aside for you and your sons; this is a perpetual law.