'Sworn' in the Bible

go and enter in unto king David, and thou hast said unto him, Hast thou not, my lord, O king, sworn to thy handmaid, saying, Surely Solomon thy son doth reign after me, and he doth sit on my throne? and wherefore hath Adonijah reigned?

And she saith to him, 'My lord, thou hast sworn by Jehovah thy God to thy handmaid: Surely Solomon thy son doth reign after me, and he doth sit on my throne;