Numbers 18:7-9

Complete Jewish Bible

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. ⁹ Here is what is to be yours of the especially holy things taken from the fire: every offering they make — that is, every grain offering, sin offering and guilt offering of theirs that they turn over to me — will be especially holy for you and your sons.