 Unlike most reciters in Kufa, he did not accept the pre-Uthmanic version of the Qur'an written by the companion of the Prophet, Abdullah ibn Masud; most of the people of Kufa continued reciting based on that version for a period even after the Uthmanic version became canon.Eventually this changed with the standardization of the mushaf, and in time Aasim's reading became the norm for the Muslim world.In fact, of the seven primary methods of recitation, only two have become particularly common in the Muslim world