9 And they shall uncover the secret places of the houses of the citadel of David; and they saw that they were many, and that one had turned the water of the old pool into the city;
Isaiah 22:9 Cross References - CAB
2 Kings 20:20
20 And the rest of the acts of Hezekiah, and all his might, and all that he made, the fountain and the aqueduct, and how he brought water into the city, are not these things written in the book of the chronicles of the kings of Judah?
2 Chronicles 32:1-6
1 And after these things and this faithful dealing, Sennacherib king of the Assyrians came to Judah, and he encamped against the fortified cities, and intended to take them for himself.
2 And Hezekiah saw that Sennacherib had come, and that his face was set to fight against Jerusalem.
3 And he took counsel with his elders and his mighty men to stop the wells of water which were outside the city; and they helped him.
4 And he collected many people, and stopped the wells of water, and the river that flowed through the city, saying, Lest the king of Assyria come, and find much water, and strengthen himself.
5 And Hezekiah strengthened himself, and built all the wall that had been pulled down, and the towers, and another wall outside, and fortified the strong place of the City of David, and prepared arms in abundance.
6 And he appointed captains of war over the people, and they were gathered to meet him to the open place of the gate of the valley, and he encouraged them, saying,
2 Chronicles 32:30
30 The same Hezekiah stopped up the course of the water of Upper Gihon, and brought the water down straight south of the City of David. And Hezekiah prospered in all his works.
Nehemiah 3:16
16 After him repaired Nehemiah son of Azbuk, ruler of half the district round about Beth Zur, as far as the garden of David's Tomb, and as far as the artificial pool, and as far as the house of the mighty men.