Leviticus 25:32-34

32Nevertheless the cities of the Levites, and the houses in the cities of their possession, the Levites may redeem at any time.

33And if a man purchases a house from the Levites, then the house that was sold in the city of his possession shall be released in the Jubilee; for the houses in the cities of the Levites are their possession among the children of Israel.

34But the field of the common-land of their cities may not be sold, for it is their perpetual possession.