Leviticus 25:32-34

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

33And if a man purchase of the Levites, then the house that was sold, and the city of his possession, shall go out in the year of jubile: for the houses of the cities of the Levites are their possession among the children of Israel.1

34But the field of the suburbs of their cities may not be sold; for it is their perpetual possession.