"I do solemnly swear (or affirm) that I will faithfully execute the Office of President of the United States, and will to the best of my Ability, preserve, protect and defend the Constitution of the United States."

from Constitutional Convention (Ft. James Madison & Thomas Jefferson) – The U.S. Constitution (Article 2) on Rap Genius

Meaning

All U.S. Presidents have taken this Oath of Office to be sworn in to the Presidency. The addition of “so help me God” to the end of the oath was a precedent established by George Washington, but is not actually part of the Constitutional Oath of Office.

Image: President Lyndon B. Johnson taking the Oath of Office on Air Force One upon receiving the news of John F. Kennedy’s death.

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