'Walled' in the Bible

And if any one sell a dwelling-house in a walled city, then he shall have the right of redemption up to the end of the year of the sale thereof; for a full year shall he have the right of redemption.

But if it be not redeemed until a whole year is complete, then the house that is in the walled city shall be established for ever to him that bought it, throughout his generations: it shall not go out in the jubilee.