Numbers 18:5-7

JPS_ASV_Byz(i) 5 And ye shall keep the charge of the holy things, and the charge of the altar, that there be wrath no more upon the children of Israel. 6 And I, behold, I have taken your brethren the Levites from among the children of Israel; for you they are given as a gift unto the LORD, to do the service of the tent of meeting. 7 And thou and thy sons with thee shall keep your priesthood in everything that pertaineth to the altar, and to that within the veil; and ye shall serve; I give you the priesthood as a service of gift; and the common man that draweth nigh shall be put to death.'