Reference: Siloam
Hastings
The name survives to-day in Silw
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So many people gathered, and they stopped up all the springs and the brook which flowed through the land, saying, Why should the kings of Assyria come and find much water?
This same Hezekiah also closed the upper springs of Gihon and directed the waters down to the west side of the City of David. And Hezekiah prospered in all his works.
The Fountain Gate was repaired by Shallum son of Col-hozeh, ruler of the district of Mizpah. He rebuilt and covered it and set up its doors, its bolts, and its bars, and the wall of the Pool of Shelah (Siloam), by the King's Garden, as far as the stairs that go down [the eastern slope] from the [portion of Jerusalem known as] the City of David.
The Fountain Gate was repaired by Shallum son of Col-hozeh, ruler of the district of Mizpah. He rebuilt and covered it and set up its doors, its bolts, and its bars, and the wall of the Pool of Shelah (Siloam), by the King's Garden, as far as the stairs that go down [the eastern slope] from the [portion of Jerusalem known as] the City of David.
Because this people [Israel and Judah] have refused and despised the waters of Shiloah [Siloam, the only perennial fountain of Jerusalem, and symbolic of God's protection and sustaining power] that go gently, and rejoice in and with Rezin [the king of Syria] and Remaliah's son [Pekah the king of Israel], Now therefore, behold, the Lord brings upon them the waters of the River [Euphrates], strong and many -- "even the king of Assyria and all the glory [of his gorgeous retinue]; and it will rise over all its channels, brooks, valleys, and canals and extend far beyond its banks;
You also made a reservoir between the two walls for the water of the Old Pool, but you did not look to the Maker of it, nor did you recognize Him Who planned it long ago.
Or those eighteen on whom the tower in Siloam fell and killed them -- "do you think that they were more guilty offenders (debtors) than all the others who dwelt in Jerusalem?
And He said to him, Go, wash in the Pool of Siloam -- "which means Sent. So he went and washed, and came back seeing.