Isaiah 36:2

And the king of Assyria sent Rabshakeh, the commander-in-chief of his army, from Lachish, a fortress in the southwestern part of Canaan, which the Assyrians wished to take preliminary to their descent upon Egypt, to Jerusalem unto King Hezekiah with a great army, a large detachment of his troops. And he, the general of the Assyrian king, stood by the conduit of the upper pool in the highway of the fuller's field, on an eminence overlooking the city from the west, 7:3. Hezekiah, in anticipation of Sennacherib's invasion, had stopped up the fountains outside of the city and conducted the water of the fountain of Gihon and that of the upper pool in a new conduit between the two walls.