Muslims believe that the Quran we have today is an exact replica of the Quran in the time of Muhammad (7th century),and it is completely preserved in heaven. Al Fadi says that we do not have a complete 7th century Quran that matches today's 1924 edition of the Quran. He adds that today's Quran was standardized in 1924 (Cairo edition), and It was based on oral transmission and not on any manuscripts.