1 Chronicles 20:1-3

1In the spring when kings march out to war, Joab led the army and destroyed the Ammonites’ land. He came to Rabbah and besieged it, but David remained in Jerusalem. Joab attacked Rabbah and demolished it.

2Then David took the crown from the head of their king, and it was placed on David’s head. He found that the crown weighed seventy-five pounds of gold, and there was a precious stone in it. In addition, David took away a large quantity of plunder from the city.

3He brought out the people who were in it and put them to work with saws, iron picks, and axes. David did the same to all the Ammonite cities. Then he and all his troops returned to Jerusalem.