Numbers 18:1-7

1So the Lord said to Aaron, “You, your sons, and your father’s household with you shall 1bear the guilt 2in connection with the sanctuary, and you and your sons with you shall bear the guilt 3in connection with your priesthood. 2But also bring your brothers with you, the tribe of Levi, the tribe of your father, so that they may 4join you and serve you, while you and your sons with you are before the tent of the testimony. 3And they shall perform duties for you and the duties of the whole tent, but 5they shall not come near the furnishings of the sanctuary and 6the altar, or both they and you will die. 4They shall join you and perform the duties of the tent of meeting, for all the service of the tent; but 7an unauthorized person shall not come near you. 5So you shall perform the 8duties of the sanctuary and the duties of the altar, 9so that there will no longer be wrath on the sons of Israel. 6Behold, I Myself 10have taken your 11fellow Levites from among the sons of Israel; they are 12a gift to you, 13dedicated to the Lord, to perform the service for the tent of meeting. 7But you and your sons with you shall 14attend to your priesthood for everything that concerns the altar and inside the veil, and you are to perform service. I am giving you the priesthood as 15a 16service that is a gift, and 17the 18unauthorized person who comes near shall be put to death.”