Numbers 18:1-7

1So the Lord said to Aaron, “You and 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 bring with you also your brothers, the tribe of Levi, the tribe of your father, that they may be 4joined with you and serve you, while you and your sons with you are before the tent of the testimony. 3And they shall thus attend to your obligation and the obligation of all the tent, but 5they shall not come near to the furnishings of the sanctuary and 6the altar, or both they and you will die. 4They shall be joined with you and attend to the obligations of the tent of meeting, for all the service of the tent; but an 7outsider may not come near you. 5So you shall attend to the 8obligations of the sanctuary and the obligations 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 concerning the altar and inside the veil, and you are to perform service. I am giving you the priesthood as 15a 16bestowed service, but 17the 18outsider who comes near shall be put to death.”