Numbers 18:20-24 - Duties Of The Levites
20 And Jehovah saith unto Aaron, 'In their land thou dost not inherit, and a portion thou hast not in their midst: I am thy portion, and thine inheritance in the midst of the sons of Israel;
21 and to the sons of Levi, lo, I have given all the tenth in Israel for inheritance in exchange for their service which they are serving -- the service of the tent of meeting. 22 'And the sons of Israel come no more near unto the tent of meeting, to bear sin, to die, 23 and the Levites have done the service of the tent of meeting, and they -- they bear their iniquity; a statute age-during to your generations, that in the midst of the sons of Israel they have no inheritance; 24 but the tithe of the sons of Israel which they lift up to Jehovah, a heave-offering, I have given to the Levites for inheritance; therefore I have said of them, In the midst of the sons of Israel they have no inheritance.'
47 And the Levites, for the tribe of their fathers, have not numbered themselves in their midst, 48 seeing Jehovah speaketh unto Moses, saying, 49 'Only, the tribe of Levi thou dost not number, and their sum thou dost not take up in the midst of the sons of Israel; 50 and thou, appoint the Levites over the tabernacle of the testimony, and over all its vessels, and over all that it hath; they bear the tabernacle, and all its vessels, and they serve it; and round about the tabernacle they encamp. 51 'And in the journeying of the tabernacle, the Levites take it down, and in the encamping of the tabernacle, the Levites raise it up; and the stranger who is coming near is put to death.'
52 And the sons of Israel have encamped, each by his camp, and each by his standard, by their hosts; 53 and the Levites encamp round about the tabernacle of the testimony; and there is no wrath on the company of the sons of Israel, and the Levites have kept the charge of the tabernacle of the testimony. 54 And the sons of Israel do according to all that Jehovah hath commanded Moses; so they have done.