Hezekiah fortifies Jerusalem
Hezekiah fortified Jerusalem, including digging a tunnel to bring water into the city.
Key passages
2 Ki 20:20

Now the remainder of the acts of Hezekiah, all of his powerful deeds, and how he made the pool and the conduit and brought the water into the city, are they not written in the scroll of the events of the days of the kings of Judah?

2 Ch 32:2–8

When Hezekiah saw that Sennacherib had come and that his face was set for battle against Jerusalem, he took counsel with his commanders and his mighty warriors to block off the waters of the springs that came from outside the city, and they helped him. Then many people were gathered, and they …

2 Ch 32:30

And this same Hezekiah blocked off the flow of the waters of the upper Gihon, and directed them down the west side of the city of David. And Hezekiah prospered in all his works.

Is 22:9–11

and you saw that the breaches in the walls of the city of David were many, and you gathered the waters of the lower pool. And you counted the houses of Jerusalem, and you broke down the houses to fortify the wall. And you made a reservoir between the walls for the waters of the old pool, …