Numbers 18:20-24 - Duties Of The Levites
20 The Lord told Aaron, “You will not have an inheritance in their land; there will be no portion among them for you. I am your portion and your inheritance among the Israelites.
21 “Look, I have given the Levites every tenth in Israel as an inheritance in return for the work they do, the work of the tent of meeting. 22 The Israelites must never again come near the tent of meeting, or they will incur guilt and die. 23 The Levites will do the work of the tent of meeting, and they will bear the consequences of their sin. The Levites will not receive an inheritance among the Israelites;
47 But the Levites were not registered with them by their ancestral tribe. 48 For the Lord had told Moses: 49 “Do not register or take a census of the tribe of Levi with the other Israelites. 50 Appoint the Levites over the tabernacle of the testimony, all its furnishings, and everything in it. They are to transport the tabernacle and all its articles, take care of it, and camp around it. 51 Whenever the tabernacle is to move, the Levites are to take it down, and whenever it is to stop at a campsite, the Levites are to set it up. Any unauthorized person who comes near it must be put to death.
52 “The Israelites are to camp by their military divisions, each man with his encampment and under his banner. 53 The Levites are to camp around the tabernacle of the testimony and watch over it, so that no wrath will fall on the Israelite community.”