1 Chronicles 20:2-3

2David took the crown of their king from his head and found that it weighed a talent of gold and that there was a precious stone in it; so it was set on David’s head. He also brought a very great amount of spoil (plunder) out of the city [of Rabbah].

3He brought out the people who were in it, and put them [to work] with saws, iron picks, and axes. David dealt in this way with all the Ammonite cities. Then David and all the people returned to Jerusalem.