2 Samuel 12:29-31

29So David gathered all the troops, went to Rabbah, attacked it and captured it.

30Then he took the crown of their king from off his head—its weight was a talent of gold and in it was a precious stone—and then it was placed on David’s head. He also brought a vast amount of spoils out of the city.

31Then he brought out the people who were there and put them to work under saws, iron threshing boards and iron axes, and assigned them to brick making; and thus he did to all the cities of the children of Ammon. Then David and all the troops returned to Jerusalem.