Art. 11. As the Government of the United States of America is not, in any sense, founded on the Christian religion; as it has in itself no character of enmity against the laws, religion, or tranquillity, of Mussulmen; and, as the said States never entered into any war, or act of hostility against any Mahometan nation, it is declared by the parties, that no pretext arising from religious opinions, shall ever produce an interruption of the harmony existing between the two countries.
From the text of the Treaty of Peace and Friendship between the United States of America and the Bey and Subjects of Tripoli of Barbary, approved by President John Adams and unanimously ratified by the United States Senate without debate in 1797. This language does not appear in the original Arabic version of the Treaty. How it was added is not known, but it was ratified.