'Sworn' in the Bible

So do God to Abner, and more also, except, as the LORD hath sworn to David, even so I do to him;

And the king called the Gibeonites, and said unto 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 unto them: and Saul sought to slay them in his zeal to the children of Israel and Judah.)