2 Chronicles 32:1-3

After these acts of faithfulness Sennacherib king of Assyria came and invaded Judah and besieged the fortified cities, and intended to break into them for himself.

Now when Hezekiah saw that Sennacherib had come and that he intended to wage war against Jerusalem,

he decided with his officers and his warriors to cut off the supply of water from the springs which were outside the city, and they helped him.