2 Samuel 21:2-6

So the king called the Gibeonites and spoke to them (now the Gibeonites were not of the sons of Israel, but of the remnant of the Amorites, and the sons of Israel had made a covenant with them, but Saul had sought to kill them in his zeal for the sons of Israel and Judah).

David said to the Gibeonites, “What should I do for you? And how can I make amends, so that you will bless the inheritance of the Lord?”

Then the Gibeonites said to him, “For us it is not a matter of silver or gold with Saul or his house, nor is it for us to put anyone to death in Israel.” Nevertheless David said, “I will do for you whatever you say.”

So they said to the king, “The man who destroyed us and who planned to eliminate us so that we would not exist within any border of Israel—

let seven men from his sons be given to us, and we will hang them before the Lord in Gibeah of Saul, the chosen of the Lord.” And the king said, “I will give them.”