The Qur'an (literally the recitation) is the main religious text of Islam. Muslims believe the Qur'an to be the verbal divine guidance and moral direction for mankind. Muslims also consider the original Arabic verbal text to be the final revelation of God. Muslims believe that the Qur'an was revealed from God to Muhammad through the angel Gabriel from 610 to 632 CE, the year of the Prophet's death. Muhammad recited the Qur'an to his thousands of followers, who recited it until they had memorized it. He also dictated it to his scribes (Muhammad was illiterate) who wrote down its verses during his lifetime. Shortly after Muhammad's death the Qur'an was established textually into a single book form by the order of the first Caliph Abu Bakr.