Rule 11-603 Oath or affirmation to testify truthfully.

Before someone can testify in court, they must promise to tell the truth. This promise is called an oath or affirmation, and the witness gives it before they start answering questions.

The point of this promise is to make the witness understand how serious their duty is. The exact words used can vary, but they need to be strong enough to remind the witness that they must be honest. This applies to every witness, no matter their religious beliefs or personal views, since a witness can choose either a religious oath or a simple affirmation.

If a witness lies after making this promise, they can face serious legal consequences, including charges of perjury. The oath or affirmation is what makes a witness's testimony official and holds them accountable for telling the truth in court.