'Walls' in the Bible

With your help I will run through an army, with help from my God I leap over walls.

Show favor to Zion in your good pleasure; and rebuild the walls of Jerusalem.

Day and night they prowl around its walls; evil and iniquity are within it.

Why did you break down its walls so that those who pass by pluck its fruits?

You have broken through all his walls; you have laid his fortresses in ruin.