Numbers 18:1-7 - Provision For The Priesthood
1 The LORD said to Aaron, "You and your sons and your fathers' house with you shall bear the iniquity of the sanctuary; and you and your sons with you shall bear the iniquity of your priesthood. 2 Your brothers also, the tribe of Levi, the tribe of your father, bring near with you, that they may be joined to you, and minister to you: but you and your sons with you shall be before the tent of the testimony. 3 They shall keep your commands, and the duty of all the Tent: only they shall not come near to the vessels of the sanctuary and to the altar, that they not die, neither they, nor you. 4 They shall be joined to you, and keep the responsibility of the Tent of Meeting, for all the service of the Tent: and a stranger shall not come near to you.
5 "You shall perform the duty of the sanctuary, and the duty of the altar; that there be no more wrath on the children of Israel. 6 I, behold, I have taken your brothers the Levites from among the children of Israel: to you they are a gift, given to the LORD, to do the service of the Tent of Meeting. 7 You and your sons with you shall keep your priesthood for everything concerning the altar, and for that inside the veil; and you shall serve: I give you the priesthood as a service of gift: and the stranger who comes near shall be put to death."