Numbers 18:20-23

20Adonai said to Aaron, “You will have no inheritance in their land nor share among them. I am your portion and your share among Bnei-Yisrael.

21See, I have given all the tithes in Israel to the sons of Levi as an inheritance in return for all the work of the service they are doing in the Tent of Meeting.

22From now on, Bnei-Yisrael must never trespass the Tent of Meeting, or they will bear the consequences of their sin and die.

23The Levites will perform the service of the Tent of Meeting. They will bear the responsibility for their iniquity. It is a permanent ordinance throughout your generations. So among Bnei-Yisrael they are to receive no inheritance.