Divrey Hayamim Bais 32:3-5

Orthodox Jewish Bible

³ He took counsel with his sarim and his gibborim to cover over the waters of the springs [Spring of Gihon] which were outside the Ir; and they did support him.

⁴ So there was gathered Am Rav together, who covered the springs, and the wadi that flowed through the midst of HaAretz, saying, Why should the melachim of Assyria come, and find mayim rabbim?

⁵ Also he strengthened himself, and repaired all the chomah that was broken down, and raised it on the migdalot, and another chomah outside of it, and repaired Millo [terraces] in Ir Dovid, and made weapons and shields in abundance.