2 Samuel 12:30-31

30Then he took their king’s crown from his head. Its weight was a talent of gold, with precious stones. And it was set on David’s head. Also he brought out the spoil of the city in great abundance.

31And he brought out the people who were in it, and put them to work with saws and iron picks and iron axes, and made them cross over to the brick works. So he did to all the cities of the people of Ammon. Then David and all the people returned to Jerusalem.