Numbers 18:1-7 - Provision For The Priesthood

¹ And the Lord said to Aaron, You and your sons and your father's family are to be responsible for all wrongdoing in relation to the holy place: and you and your sons are to be responsible for the errors which come about in your work as priests. ² Let your brothers, the family of Levi, come near with you, so that they may be joined with you and be your servants: but you and your sons with you are to go in before the ark of witness. ³ They are to do your orders and be responsible for the work of the Tent; but they may not come near the vessels of the holy place or the altar, so that death may not overtake them or you. ⁴ They are to be joined with you in the care of the Tent of meeting, doing whatever is needed for the Tent: and no one of any other family may come near you.

⁵ You are to be responsible for the holy place and the altar, so that wrath may never again come on the children of Israel. ⁶ Now, see, I have taken your brothers the Levites from among the children of Israel: they are given to you and to the Lord, to do the work of the Tent of meeting. ⁷ And you and your sons with you are to be responsible as priests for the altar and everything on it, and everything inside the veil; you are to do the work of priests; I have given you your position as priests; and any other man who comes near will be put to death.