'Walls of Jerusalem' in the Bible

I went out by night by the valley gate, even toward the jackal's well, and to the dung gate, and viewed the walls of Jerusalem, which were broken down, and its gates were consumed with fire.

But it happened that when Sanballat, Tobiah, the Arabians, the Ammonites, and the Ashdodites heard that the repairing of the walls of Jerusalem went forward, [and] that the breaches began to be stopped, then they were very angry;