Rule 603.
Before testifying, a witness must give an oath or affirmation to testify truthfully. It must be in a form designed to impress that duty on the witness’s conscience.
([Pub. L. 93–595, § 1], Jan. 2, 1975, [88 Stat. 1934]; Mar. 2, 1987, eff. Oct. 1, 1987; Apr. 26, 2011, eff. Dec. 1, 2011.)