2 Chronicles 32:1-3

1After all these acts of faithfulness, Sennacherib king of Assyria came and invaded Judah. He laid siege to the fortified cities, intending to conquer them for himself.

2When Hezekiah saw that Sennacherib had come to make war against Jerusalem, 3he consulted with his leaders and mighty men about stopping up the waters of the springs outside the city, and they helped him carry it out.