The Gibeonites answered him, "We have no right to demand silver or gold from Saul or his family, nor do we have the right to put anyone in Israel to death."1 "What do you want me to do for you?" David asked.
References for 2 Samuel 21:4
They answered the king, "As for the man who destroyed us and plotted against us so that we have been decimated and have no place anywhere in Israel,
let seven of his male descendants be given to us to be killed and exposed2 before the LORD at Gibeah of Saul--the Lord's chosen3 one." So the king said, "I will give them to you."
References for 2 Samuel 21:6