Main article: Qur'an
The Qur'an (also spelled "Quran" or "Koran") is the holy book of Islam. Its title means "Recitation" or "Reading". It consists of 114 chapters (or Surahs) laid out roughly in order of size, the largest being near the front, the smallest near the back. It is regarded by Muslims as God's message to Humanity; describing the origins of the Universe, Man, and their relationship to each other and their Creator. It sets out rules for society, morality, economics and many other topics. It is intended for recitation and memorization. The Qur'an is primarily taught from one generation to the next this way. Muslims regard the Qur'an as sacred and inviolable. Muslims do not touch the book unless in a state of ablution, known as "wudu." Muslims will typically keep it on a high shelf in their room, as a show of respect for the Qur'an, and some carry small versions with them for comfort or security. Only the original Arabic version of it is regarded as the Qur'an; an attempt at translations would omit the original's meaning and nuance, as well as flow of the verse.
For Muslims, the Qur'an answers questions about daily needs, both spiritual and material. It discusses God and God's Names and attributes; believers and their virtues, and the fate of non-believers (kuffar); Mary, Jesus, and all the other prophets; and even scientific subjects. Muslims do not follow the laws of the Qur'an exclusively; they also follow the example of Muhammad, which is known as the Sunnah, and the understanding of the Qur'an contained in the teachings of the prophet known as the Ahadith.
Muslims are taught that God sent down other books. Besides the Qur'an, the others are the book of Ibrahim (now lost) the Law of Moses (the Taurah), the Psalms of David (the Zabûr) and the Gospel of Jesus (the Injil). The Qur'an describes Christians and Jews as "the people of the Book" (ahl al Kitâb). The teachings of Islam concern many of the same personages as those of Judaism and Christianity. However, Muslims frequently refer to them using Arabic names which can make it appear they are talking about different people: e.g. Allah for God, Iblis for Satan, Ibrahim for Abraham, and so forth. (See also: The Bible in Islam)
The Qur'an has had its share of controversy. A few critics have stated that there were verses removed, known as