The Qur'an is the sacred text of the Muslim religion, also known as the scripture of Muslims and therefore of those who practice Islam.
It is the oldest known literary work in Arabic. The Qur'an gathers together the words of Allah ("God"), the revelations (or "Aya") he made to the world through the intermediary of the prophet and messenger Mohammed (Muhammad) until his death in 632. This message corresponds to what man cannot learn on his own, nor discover by his own means: it answers existential questions rather than the physical laws of the universe. This message is universal and gives the believer a purpose, a reason for being (the origin, purpose and meaning of life).
The Qur'an is thus a true reference work for all Muslims, regardless of their language or location.