'Walled' in the Bible

"'If a man sells a residential house in a walled city, its right of redemption must extend until one full year from its sale; its right of redemption must extend to a full calendar year.

If it is not redeemed before the full calendar year is ended, the house in the walled city will belong without reclaim to the one who bought it throughout his generations; it will not revert in the jubilee.