Okla. Stat. tit. 12, § 2603
Every witness shall be required to declare before testifying that the witness will testify truthfully, by oath or affirmation administered in a form calculated to awaken the witness’s conscience and impress the witness’s mind with the duty to do so.
Laws 1978, SB 276, c. 285, § 603, eff. October 1, 1978; Amended by Laws 2002, HB 1939, c. 468, § 43, eff. November 1, 2002 (superseded document available).