'Sworn' in the Bible

So do God to Abner, and more also, if, as Jehovah has sworn to David, I do not so to him;

And 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.)