2 Samuel 12:31

12:31 He removed the people who were in it and made them do hard labor with saws, iron picks, and iron axes, putting them to work at the brick kiln. This was his policy with all the Ammonite cities. Then David and all the army returned to Jerusalem.

2 Samuel 21:4

21:4 The Gibeonites said to him, “We have no claim to silver or gold from Saul or from his family, nor would we be justified in putting to death anyone in Israel.” David asked, “What then are you asking me to do for you?”