Numbers 18:7-9
Darby Translation
7 But thou and thy sons with thee shall attend to your priesthood for all that concerneth the altar, and for that which is inside the veil; and ye shall perform the service: I give you your priesthood as a service of gift, and the stranger that cometh near shall be put to death.
8 And Jehovah spoke to Aaron, And I, behold, I have given thee the charge of my heave-offerings, of all the hallowed things of the children of Israel; to thee have I given them, because of the anointing, and to thy sons by an everlasting statute.
9 This shall be thine of the most holy things, [reserved] from the fire: every offering of theirs, of all their oblations, and of all their sin-offerings, and of all their trespass-offerings, which they render unto me, it is most holy for thee and for thy sons.
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