2 Chronicles 32:1-3

1After these deeds of faithfulness, Sennacherib king of Assyria came and entered Judah; he encamped against the fortified cities, thinking to win them over to himself.

2And when Hezekiah saw that Sennacherib had come, and that his purpose was to make war against Jerusalem,

3he consulted with his leaders and commanders to stop the water from the springs which were outside the city; and they helped him.