1 Chronicles 20:2-3

2And David took the crown of their king from off his head, and found it to weigh a talent of gold, and there were precious stones in it; and it was [set] upon David's head: and he brought forth the spoil of the city in great abundance.

3And he brought out the people that were in it, and cut them with the saw, and with harrows of iron, and with saws. And so David did to all the cities of the children of Ammon. And David and all the people returned to Jerusalem.