Numbers 18:2-7

²Bring your brothers also, the tribe of Levi, the tribe of your father, 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.

³They shall keep your commands and the duty of the whole 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.

⁴They shall be joined to you and keep the responsibility of the Tent of Meeting, for all the service of the Tent. 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.

⁶Behold, I myself have taken your brothers the Levites from amongst the children of Israel. They are a gift to you, dedicated to the LORD, to do the service of the Tent of Meeting.

⁷You and your sons with you shall keep your priesthood for everything of the altar, and for that within the veil. You shall serve. I give you the service of the priesthood as a gift. The stranger who comes near shall be put to death.”