Numbers 18:1-7 - Provision For The Priesthood
1 And Jehovah will say to Aaron, Thou, and thy sons, and thy father's house with thee, shall bear the iniquity of the holy place: and thou and thy sons with thee, shall bear the iniquity of your priesthood. 2 And also thy brethren, the tribe of Levi, the tribe of thy father, bring thou near with thee, and they shall be joined to thee, and they shall serve thee: and thou and thy sons with thee, before the tent of testimony. 3 And they watched thy watches, and the watches of all the tent: but to the vessels of the holy place, and to the altar they shall not come near, and they shall not die, also they, also ye. 4 And they were joined to thee, and they watched the watches of the tent of appointment for all the service of the tent: and the stranger shall not come near to you
5 And ye watched the watches of the holy place, and the watches of the altar; and anger shall no more be upon the sons of Israel. 6 And I, behold, I took your brethren the Levites from the midst of the sons of Israel: to you being given a gift to Jehovah to serve the services of the tent of appointment 7 And thou and thy sons with thee shall watch your priesthood for all the word of the altar, and to within the vail; and ye served: the services a gift I will give your priesthood; and the stranger coming near shall die.