2 Chronicles 32:1-8

After these things and this faithfulness, Sennacherib king of Assyria came and invaded Judah and besieged the fortified cities, intending to take them for himself. When Hezekiah saw that Sennacherib had come and that he intended to go to war against Jerusalem, 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. 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?” Also Hezekiah resolutely set to work and rebuilt all the wall that had been broken down, and erected towers on it, and he built another wall outside and strengthened the Millo (fortification) in the City of David, and made a great number of weapons and shields. He also appointed military officers over the people and gathered them to him in the square at the city gate, and spoke encouragingly to them, saying, “Be strong and courageous. Do not fear or be dismayed because of the king of Assyria, nor because of all the army that is with him; for the One with us is greater than the one with him. With him there is only an arm of flesh, but with us is the LORD our God to help us and to fight our battles.” And the people relied on the words of Hezekiah king of Judah.