2 Chronicles 32:2-4

Amplified Bible

² When Hezekiah saw that Sennacherib had come and that he intended to go to war against Jerusalem, ³ he decided, together with his officers and his soldiers, to stop up the water [supply] from the springs which were outside the city [by enclosing them with masonry and concealing them], and they helped him. ⁴ So many people came together, and they stopped up all the springs and the brook which flowed [underground] through the region, saying, “Why should the kings of Assyria come and find an abundance of water?”