Numbers 18:1-7 - Provision For The Priesthood
1 And Jehovah said to Aaron, You and your sons, and your father's 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 And bring your brothers also of the tribe of Levi, the tribe of your father with you, so that they may be joined to you and minister to you, you and your sons with you, before the tabernacle of witness. 3 And they shall keep your charge and the charge of all the tabernacle. Only they shall not come near the vessels of the sanctuary and the altar, so that neither they nor you also may die. 4 And they shall be joined to you, and keep the charge of the tabernacle of the congregation, for all the service of the tabernacle. And a stranger shall not come near you.
5 And you shall keep the charge of the sanctuary and the charge of the altar, so that there may be no wrath any more upon the sons of Israel. 6 And I, behold, I have taken your brothers the Levites from among the sons of Israel. They are given to you as a gift by Jehovah, to do the service of the tabernacle of the congregation. 7 Therefore you and your sons with you shall keep your priests' office for everything of the altar and inside the veil. And you shall serve. I have given your priest's office as a service of gift. And the stranger that comes near shall be put to death.