US Constitution
The Senators and Representatives before mentioned, and the members of the several state legislatures, and all executive and judicial officers, both of the United States and of the several states, shall be bound by oath or affirmation, to support this Constitution; but no religious test shall ever be required as a qualification to any office or public trust under the United States.
“Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof…”
Download copies of the Constitution from the National Archives.
Indexed version of Constitution available at Cornell University.