Numbers 18:21-24

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.

22The Israelites must never again come near the tent of meeting, or they will incur guilt and die.

23The Levites will do the work of the tent of meeting, and they will bear the consequences of their iniquity. The Levites will not receive an inheritance among the Israelites; this is a permanent statute throughout your generations.

24For I have given them the tenth that the Israelites present to the Lord as a contribution for their inheritance. That is why I told them that they would not receive an inheritance among the Israelites.”