Numbers 18:5

2 and also thy brethren, the tribe of Levi, the tribe of thy father, bring near with thee, and they are joined unto thee, and serve thee, even thou and thy sons with thee, before the tent of the testimony.

3 `And they have kept thy charge, and the charge of all the tent; only, unto the vessels of the sanctuary and unto the altar they do not come near, and they die not, either they or you;

4 and they have been joined unto thee, and have kept the charge of the tent of meeting, for all the service of the tent; and a stranger doth not come near unto you;

5 and ye have kept the charge of the sanctuary, and the charge of the altar, and there is no more wrath against the sons of Israel.

6 `And I, lo, I have taken your brethren the Levites from the midst of the sons of Israel; to you a gift they are given by Jehovah, to do the service of the tent of meeting;

7 and thou, and thy sons with thee, do keep your priesthood, for everything of the altar, and within the vail, and ye have served; a service of gift I make your priesthood; and the stranger who is coming near is put to death.'

8 And Jehovah speaketh unto Aaron: `And I, lo, I have given to thee the charge of My heave-offerings, of all the hallowed things of the sons of Israel--to thee I have given them for the anointing, and to thy sons, by a statute age-during.