This chapter focuses on the great work of Muhammad’s life, the Qur’an, and considers how it came into being, what is its position in Islam, and some of its theological concepts. Many assume that the Qur’an and the Bible occupy similar positions in their respective spheres. The Qur’an has certainly exercised an enormous religious influence over the thinking of millions, but in another line its influence has been perhaps equally important: the Qur’an has formed and stabilized the Arabic language. Yet in spite of accepting an unpliant form of revelation, the Muslim has no exact idea of the sequence in which the different parts of the Qur’an were revealed. Muslims have a fundamentally different conception of God. The pilgrimage is obligatory on every adult Muslim of either sex. Makka therewith was raised from a centre of pagan Arabia to the religious centre of the Muslim world.