Leviticus 25:32-34

32“But as for the towns of the Levites, the Levites may have a permanent right of redemption for the houses in the towns of their possession.

33The Levites may redeem a house sold in the town of its possession. Also it shall be released in the Jubilee, for the houses of the Levitical towns are their possession among Bnei-Yisrael.

34But the fields in the pasturelands of their cities may not be sold, for it is their permanent possession.