The present arrangement of the Qur'an is not the work of later generations, but was made by the Prophet under God's direction. Whenever a surah was revealed, the Prophet summoned his scribes, to whom he carefully dictated its contents, and instructed them where to place it in relation to the other surahs. The Prophet followed the same order of surahs and verse when reciting during ritual Prayer as on other occasions, and his Companions followed the same practice in memorizing the Qur'an. It is therefore a historical fact that the collection of the Qur'an came to an end on the very day that its revelation ceased.