Thematic Bible: Being made without an oath

Moreover, forasmuch as he was not [made priest] without an oath, (for they indeed were made priests without an oath; but he with an oath, by him who said unto him, "The Lord hath sworn, and will not repent, Thou art a priest for ever after the order of Melchisedec:") by so much is Jesus become the surety of a better testament.