Leviticus 25:32-33

³²But as for the cities of the Levites, the houses of the cities of their possession, the Levites shall have a perpetual right of redemption.

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