1 Chronicles 20:2-3

21David took the crown of 2their king from his head, and he found it to weigh a 3talent of gold, and there was a precious stone in it; and it was placed on David’s head. And he brought out the spoils of the city, a very great amount. 3He brought out the people who were in it, 4and 5put them to work at saws, iron picks, and axes. And David did the same to all the cities of the sons of Ammon. Then David and all the people returned to Jerusalem.