Lisan Al-Gaib

A Chakobsa term, the language of the Fremen people in Frank Herbert's Dune book series, that translates to "The Voice from the Outer World". The term refers to a visitor from another planet who would lead the Fremen to paradise, a prophecy implanted by the Bene Gesserit witches to control the Fremen. Paul Atreides / Paul Muad'Dib takes up the title in the first book in the series.

He knows our ways as if born to them, he must be the Lisan Al-Gaib!