Leviticus 25:32-34

25:32 As for the cities of the Levites, the houses in the cities which they possess, the Levites must have a perpetual right of redemption. 25:33 Whatever someone among the Levites might redeem – the sale of a house which is his property in a city – must revert in the jubilee, because the houses of the cities of the Levites are their property in the midst of the Israelites. 25:34 Moreover, the open field areas of their cities must not be sold, because that is their perpetual possession.