2 Chronicles 25:11-13

11Then Amaziah strengthened himself, and leading his people, he went to the Valley of Salt and killed ten thousand of the people of Seir.

12Also the children of Judah took captive ten thousand alive, brought them to the top of the rock, and cast them down from the top of the rock, so that they all were dashed in pieces.

13But as for the soldiers of the army which Amaziah had discharged, so that they would not go with him to battle, they raided the cities of Judah from Samaria to Beth Horon, killed three thousand in them, and took much spoil.