Numbers 18:1-7

1And the LORD said to Aaron, Thou and thy sons and thy father’s house with thee shall bear the iniquity of the sanctuary: and thou and thy sons with thee shall bear the iniquity of your priesthood. 2And thy brethren also of the tribe of Levi, the tribe of thy father, bring thou with thee, that they may be joined to thee, and minister to thee: but thou and thy sons with thee shall minister before the tabernacle of witness. 3And they shall keep thy charge, and the charge of all the tabernacle: only they shall not come near the vessels of the sanctuary and the altar, that neither they, nor ye also, die. 4And they shall be joined to thee, and keep the charge of the tabernacle of the congregation, for all the service of the tabernacle: and a stranger shall not come near to you. 5And ye shall keep the charge of the sanctuary, and the charge of the altar: that there be no wrath any more upon the children of Israel. 6And I, behold, I have taken your brethren the Levites from among the children of Israel: to you they are given as a gift for the LORD, to do the service of the tabernacle of the congregation. 7Therefore thou and thy sons with thee shall keep your priest’s office for every thing of the altar, and within the veil; and ye shall serve: I have given your priest’s office to you as a service of gift: and the stranger that cometh near shall be put to death.