CLV(i)
2 Moreover, bring near with you your brothers of the stock of Levi, the tribe of your father, that they may be obligated to you and may minister to you when you and your sons with you are before the tent of the testimony.
3 They will keep guard of you and guard of the entire tent; only to the furnishings of the holy place and to the altar they shall not come near so that they may not die, both they and you.
4 They will be obligated to you and will keep guard of the tent of appointment for all the service of the tent. Yet no alien may come near to you.