2 Chronicles 32:30

The upper water-course of Gihon; a rivulet near Jerusalem consisting of two streams, the upper, which was brought into one pool, called the upper pool, Isaiah 7:3; and the lower, which was brought into another, called the lower pool, Isaiah 22:9. The former he diverted and brought by secret pipes into Jerusalem, which was a work of great art, and labour, and policy, and therefore is here commended. Brought it straight down; whereas before it fetched a compass, and thereby might have been beneficial to the Assyrian host.