Numbers 18:20-23

20Then the Lord said to Aaron, “1You shall have no inheritance in their land nor own any portion among them; 2I am your portion and your inheritance among the sons of Israel.

21“To the sons of Levi, behold, I have given all the 3tithe in Israel for an inheritance, in return for their service which they perform, the service of the tent of meeting. 224The sons of Israel shall not come near the tent of meeting again, or they will bear sin and die. 23Only the Levites shall perform the service of the tent of meeting, and they shall 5bear their iniquity; it shall be a perpetual statute throughout your generations, and among the sons of Israel 6they shall have no inheritance.