2 Samuel 21:1-2

1And there was a famine in the days of David three years, year after year; and David inquired of Jehovah. And Jehovah said, It is for Saul, and for [his] house of blood, because he slew the Gibeonites.

2And the king called the Gibeonites, and spoke to them. (Now the Gibeonites were not of the children of Israel, but of the remainder of the Amorites; and the children of Israel had sworn to them; and Saul sought to smite them in his zeal for the children of Israel and Judah.)