Numbers 18:20-23

20The Lord spoke to Aaron, “You will have no inheritance in their land, nor will you have any portion of property among them – I am your portion and your inheritance among the Israelites.

21See, I have given the Levites all the tithes in Israel for an inheritance, for their service which they perform – the service of the tent of meeting.

22No longer may the Israelites approach the tent of meeting, or else they will bear their sin and die.

23But the Levites must perform the service of the tent of meeting, and they must bear their iniquity. It will be a perpetual ordinance throughout your generations that among the Israelites the Levites have no inheritance.