Numbers 18:20-24 - Duties Of The Levites
20 And the Lord said to Aaron, You will have no heritage in their land, or any part among them; I am your part and your heritage among the children of Israel.
21 And to the children of Levi I have given as their heritage all the tenths offered in Israel, as payment for the work they do, the work of the Tent of meeting. 22 In future the children of Israel are not to come near the Tent of meeting, so that death may not come to them because of sin. 23 But the Levites are to do the work of the Tent of meeting, and be responsible for errors in connection with it: this is a law for ever through all your generations; and among the children of Israel they will have no heritage. 24 For the tenths which the children of Israel give as a lifted offering to the Lord I have given to the Levites as their heritage. and so I have said to them, Among the children of Israel they will have no heritage.
47 But the Levites, of the tribe of their fathers, were not numbered among them. 48 For the Lord said to Moses, 49 Only the tribe of Levi is not to be numbered among the children of Israel, 50 But to them you are to give the care of the Tent of meeting with its vessels and everything in it: they are to take up the Tent, and be responsible for everything to do with it, and put up their tents round it. 51 And when the Tent of meeting goes forward, the Levites are to take it down; and when it is to be put up, they are to do it: any strange person who comes near it is to be put to death.
52 The children of Israel are to put up their tents, every man in his tent-circle round his flag. 53 But the tents of the Levites are to be round the Tent of meeting, so that wrath may not come on the children of Israel: the Tent of meeting is to be in the care of the Levites. 54 So the children of Israel did as the Lord had given orders to Moses.