Numbers 18:23-24

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.”