'But if it is not bought back for him within the space of a full year, then the house that is in the walled city passes permanently to its purchaser throughout his generations; it does not revert in the jubilee. 'The houses of the villages, however, which have no surrounding wall shall be considered as open fields; they have redemption rights and revert in the jubilee. 'As for cities of the Levites, the Levites have a permanent right of redemption for the houses of the cities which are their possession.