Islam appeared in the form of a book: the Quran. Muslims, consider the Quran (sometimes spelled "Koran") to be the Word of God as transmitted by the Angel Gabriel, in the Arabic language, through the Prophet Muhammad. The Muslim view, moreover, is that the Quran supersedes earlier revelations; it is regarded as their summation and completion. It is the final revelation, as Muhammad is regarded as the final prophet - 'the Seal of the Prophets."
In a very real sense the Quran is the mentor of millions of Muslims, Arab and non-Arab alike; it shapes their everyday life, anchors them to a unique system of law, and inspires them by its guiding principles. Written in noble language, this Holy Text has done more than move multitudes to tears and ecstasy; it has also, for almost fourteen hundred years, illuminated the lives of Muslims with its eloquent message of uncompromising monotheism, human dignity, righteous living, individual responsibility, and social justice. For countless millions, consequently, it has been the single most important force in guiding their religious, social, and cultural lives. Indeed, the Quran is the cornerstone on which the edifice of Islamic civilization has been built.
The text of the Quran was delivered orally by the Prophet Muhammad to his followers as it was revealed to him. The first verses were revealed to him in or about 610, and the last revelation dates from the last year of his life, 632. His followers at first committed the Quran to memory and then, as instructed by him, to writing. Although the entire contents of the Quran, the placement of its verses, and the arrangement of its chapters date back to the Prophet, as long as he lived he continued to receive revelations. Consequently, the Holy Text could only be collected as a single corpus - "between the two covers" - after the death of Muhammad. This is exactly what happened. After the battle of al-Yamamah in 633, 'Umar ibn al-Khattab, later to become