Allah has commanded you to recite to your people the Qur'an in one dialect. Upon this he said: I ask from Allah pardon and forgiveness. My people are not capable of doing it. He then came for the second time and said: Allah has commanded you that you should recite the Qur'an to your people in two dialects. Upon this he (the Holy prophet) again said: I seek pardon and forgiveness from Allah, my people would not be able to do so. He (Gabriel) came for the third time and said: Allah has commanded you to recite the Qur'an to your people in three dialects. Upon this he said: I ask pardon and forgiveness from Allah. My people would not be able to do it. He then came to him for the fourth time and said: Allah has commanded you to recite the Qur'an to your people in seven dialects, and in whichever dialect they would recite, they would be right. (Using translation from Muslim 821a)
"أتانى جبريلُ فقال: إن الله يأمُرُكَ أن تُقْرِئ أُمّتك القُرآن على حرفٍ، فقلت: أسألُ الله معافاته ومَغْفِرته، فإنَّ أمتى لا تُطيق ذلك، ثم أتانى الثانيةَ فقال إِنَّ الله يَأمُرُكَ أنْ تُقْرأَ أُمَّتَكَ القُرآنَ عَلَي حَرْفَيْنِ، أَسْألُ الله مُعَافَاته وَمَغْفِرتِه وإِنّ أُمَّتىِ لا تُطَيقُ ذَلِكَ ثم جَاءَنِى الثَّالثَةَ فَقَالَ إِنَّ الله يأمُرُكَ انْ تُقْرِأَ أُمَّتَكَ الْقُرآنَ عَلَىَ ثَلاَثةِ أَحرَفٍ، فقلت: أسألُ الله معافاته ومغفرته، وإنّ أمتى لا تطيق ذلك، ثم جاءنى الرابعة فقال: إن الله يأمرك أن تقرئ أمتك القرآن على سبعة أحرف، فأيُّما حرفٍ قرءوا عليه فقد أصابوا".