'Sworn' in the Bible

God do so to Abner, and more also, if, as Yahweh has sworn to David, I don't do even so to him;

The king called the Gibeonites, and said to them (now the Gibeonites were not of the children of Israel, but of the remnant of the Amorites; and the children of Israel had sworn to them: and Saul sought to kill them in his zeal for the children of Israel and Judah);