Numbers 18:5-7

Complete Jewish Bible

⁵ You will take charge of all the holy things and the altar, so that there will no longer be anger against the people of Isra’el. 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.”