2 Chronicles 32:3-5

3 he took counsel with his rulers and his mighty men to stop the waters of the fountains which were outside the city. And they helped him.

4 So there was gathered together many people. And they stopped all the fountains, and the brook that flowed through the midst of the land, saying, Why should the kings of Assyria come, and find much water?

5 And he took courage, and built up all the wall that was broken down, and raised it up to the towers, and the other wall outside, and strengthened Millo in the city of David, and made weapons and shields in abundance.