1 Chronicles 18:12

12 Moreover Avishai the son of Tzeru'yah struck of the Edom in the Valley of Salt eighteen thousand.

1 Chronicles 18:12 In-Context

10 he sent Hadoram his son to king David, to Greet him, and to bless him, because he had fought against Hadad`ezer and struck him; (for Hadad`ezer had wars with To`u;) and [he had with him] all manner of vessels of gold and silver and brass.
11 These also did king David dedicate to the LORD, with the silver and the gold that he carried away from all the nations; from Edom, and from Mo'av, and from the children of `Ammon, and from the Pelishtim, and from `Amalek.
12 Moreover Avishai the son of Tzeru'yah struck of the Edom in the Valley of Salt eighteen thousand.
13 He put garrisons in Edom; and all the Edom became servants to David. The LORD gave victory to David wherever he went.
14 David reigned over all Yisra'el; and he executed justice and righteousness to all his people.
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