What does a person say when sworn in an oath?

You put your hand on The Bible, and then the officer says, "Do you swear to tell the truth, the whole truth, and nothing but the truth, or help me god?" Then, the person swearing says, "I do." Thats how it works. This is called, 'Swearing into Court.' If you get caught lieing, you could go to jail under 'Prejury'- Lieing under oath.