Syalabi wrote, in his book that Abu Bakar has collected Al-Qur'an comprising seven readings which are allowed to be read. He did not specify on one certain reading. A lot of his friends also had their own mushaf. The differences, then, caused the different reading among Iraq and Syam society. This dispute made Khudzaifah bin al-Yaman was angry. He informed it to Usman bin Affan r.a. and finally Usman united the people in one letter or one reading and Rasm.
                        
                        
                        
                        
                            
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