Nehemiah 3:15

But the Gate of the Fountain, near the Pool of Siloam, repaired Shallum, the son of Colhozeh, the ruler of part of Mizpah, of the circuit of Mizpah; for this was under the jurisdiction of a different man than the city itself; he built it and covered it, laying the cross-beams as in the case of the other gates, and set up the doors thereof, the locks thereof, and the bars thereof, and the wall of the Pool of Siloah by the king's garden, the royal park being watered from this pool, which received its water through a subterranean channel tunneled from the west side of the Kidron Valley, under the lower ridge of Ophel, which ran south of the Temple area, and unto the stairs that go down from the City of David, an inclined road leading down from the upper city.