Amendment 2 - Right to Bear Arms. Ratified 12/15/1791.
A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.
In the context of the Constitution, phrases like "shall not be infringed," "shall make no law," and "shall not be violated" sound pretty unbendable, but the Supreme Court has ruled that some laws can, in fact, encroach on these phrases.