Bible Verses About Walls of the Cities: Double

they broke through into the city. All the soldiers [fled] by night through the gate between the two walls, near the king's garden. Because the Kasdim were surrounding the city, the king took the route through the 'Aravah.

You also built a reservoir between the two walls for the water from the Old Pool; but you didn't look to Him who made these things; you had no respect for Him who fashioned them long ago.