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that the witness has personal knowledge of the matter. Evidence to prove personal knowledge may, but need not, consist of the witness’s own testimony. This rule is subject to the provisions of Rule 703, relating to opinion testimony by expert witnesses. Rule 603. Oath or Affirmation to Testify Truthfully Before testifying, a witness shall be presumed to have been sworn in, by an oath or affirmation to testify truthfully administered in a form designed to impress that duty on the witness’s conscience. Rule 604. Omitted Rule 605. Judge’s Competency as a Witness The presiding judge may not testify as a witness at the trial. A party need not object to preserve the issue. Rule 606. Omitted Rule 607. Who May Impeach a Witness Any party, including the party that called the witness, may attack the witness’s credibility. Rule 608. A Witness’s Character for Truthfulness or Untruthfulness (a) Reputation or Opinion Evidence. A witness’s credibility may be attacked or supported by testimony about the witness’s reputation for having a character for truthfulness or untruthfulness, or