Numbers 18:7-9

Young's Literal Translation

⁷ and thou, and thy sons with thee, do keep your priesthood, for everything of the altar, and within the vail, and ye have served; a service of gift I make your priesthood; and the stranger who is coming near is put to death.'

⁸ And Jehovah speaketh unto Aaron: `And I, lo, I have given to thee the charge of My heave-offerings, of all the hallowed things of the sons of Israel -- to thee I have given them for the anointing, and to thy sons, by a statute age-during.

⁹ This is thine of the most holy things, from the fire: all their offering, to all their present, and to all their sin-offering, and to all their guilt-offering, which they give back to Me, is most holy to thee, and to thy sons;