'Walls' in the Bible

By Your favor do good to Zion;May You rebuild the walls of Jerusalem.

Day and night they go around her walls;Wickedness and mischief are in her midst.

Why have You broken down its walls and hedges,So that all who pass by pick its fruit?

You have broken down all his [city] walls;You have brought his strongholds to ruin.

“May peace be within your wallsAnd prosperity within your palaces.”