'Twelve' in the Bible

{To the chief Musician upon Shushaneduth, Michtam of David, to teach; when he strove with Aramnaharaim and with Aramzobah, when Joab returned, and smote of Edom in the valley of salt twelve thousand.} O God, thou hast cast us off, thou hast scattered us, thou hast been displeased; O turn thyself to us again.