'Walls of Jerusalem' in the Bible

I went out at night through the Valley Gate toward the Serpent’s Well and the Dung Gate, and I inspected the walls of Jerusalem that had been broken down and its gates that had been destroyed by fire.

When Sanballat, Tobiah, and the Arabs, Ammonites, and Ashdodites heard that the repair to the walls of Jerusalem was progressing and that the gaps were being closed, they became furious.

In Your good pleasure, cause Zion to prosper;build the walls of Jerusalem.

The Chaldeans next burned down the king’s palace and the people’s houses and tore down the walls of Jerusalem.