The Qur'an (Koran, Quran) is the Holy Book of Islam and the religion's most sacred writing. Muslims consider it the actual word of Allah and not the word of Muhammad to whom it was given. Muslim tradition states that the angel Gabriel visited Muhammad and gave him the words directly from Allah. These words were Allah's words of wisdom, truth, and commandments to His creation. The Qur'an (which means recitation) was revealed in the Arabic dialect used by the Quraish tribe of Mecca of that time. This dialect became the formal Arabic of the Islamic nations due to the distribution of Qur'anic scriptures throughout the Islamic empire. In the Arabic the Qur'an is poetic in style with rhymes, meter, and shifts in line lengths. Those who speak the language say it is a beautiful work.
The Qur'an deals mainly with what and how Allah wants mankind to believe and do in Man's moral struggle. Its primary theme is that of complete submission to the will of Allah.