"Rule 603 merely provides that a witness before testifying must either by oath or affirmation declare that he will testify truthfully. State v. James, 322 N.C. 320, 323, 367 S.E.2d 669, 671 (1988).
N.c. Ct. App. Leg. Stand., EVIDENTIARY MATTERS, Oath or Affirmation (N.C.R. Evid. 603)