'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 now, rise, go out and speak unto the heart of thy servants, for by Jehovah I have sworn, that -- thou art not going out -- there doth not lodge a man with thee to-night; and this is worse for thee than all the evil that hath come upon thee from thy youth till now.'

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.)

But the king spared Mephibosheth the son of Jonathan, the son of Saul, because of the sworn oath of Yahweh which [was] between them, between David and Jonathan the son of Saul.