'Walled' in the Bible

"If a person sells a residential house in a walled city, he is to redeem it within the year in which it was sold. He may have right to its redemption for a full year.

"As soon as you receive this letter (since your master's children are with you, you have chariots and horses there with you, and you are protected by a walled city and weaponry),

During the fourteenth year of the reign of King Hezekiah, King Sennacherib of Assyria approached all of the walled cities of Judah and seized them.

and appointing judges throughout the land in all of the walled cities of Judah, city by city. He issued this reminder to the judges:

He has walled me in so I cannot escape; he placed heavy chains on me.