2 Samuel 8:13 in the King James Version
And David gat him a name when he returned from smiting of the Syrians in the valley of salt, being eighteen thousand men.
Context
12 of Syria, of Moab, of the children of Ammon, of the Philistines, of Amalek, and of the plunder of Hadadezer, son of Rehob, king of Zobah.
13 David earned a reputation when he returned from striking down eighteen thousand men of the Syrians in the Valley of Salt.
14 He put garrisons in Edom. Throughout all Edom, he put garrisons, and all the Edomites became servants to David. The LORD gave victory to David wherever he went.