"The Messenger of Allah ﷺ taught me a surah, and when I was sitting in the masjid I heard a man reciting it in a way that was different from mine. I said to him: 'Who taught you this surah?' He said: 'The Messenger of Allah ﷺ.' I said: 'Stay with me until we go to the Messenger of Allah ﷺ.' So we came to him and I said: 'O Messenger of Allah, this man recites a surah that you taught me differently.' The Messenger of Allah ﷺ said: 'Recite, O Ubayy.' So I recited it, and the Messenger of Allah ﷺ said to me: 'You have done well.' Then he said to the man: 'Recite.' So he recited it and it was different to my recitation. The Messenger of Allah ﷺ said to him: 'You have done well.' Then the Messenger of Allah ﷺ said: 'O Ubayy, the Quran has been revealed with seven different modes of reciation, all of which are good and sound." (Using translation from Nasāʾī 940)  

أَقْرَأَنِي رَسُولُ اللهِ ﷺ سُورَةً فَبَيْنَا أَنَا فِي الْمَسْجِدِ جَالِسٌ إِذْ سَمِعْتُ رَجُلًا يَقْرَؤُهَا يُخَالِفُ قِرَاءَتِي فَقُلْتُ لَهُ مَنْ عَلَّمَكَ هَذِهِ السُّورَةِ؟ فَقَالَ رَسُولُ اللهِ ﷺ فَقُلْتُ لَا تُفَارِقْنِي حَتَّى نَأْتِي رَسُولَ اللهِ ﷺ فَأَتَيْنَاهُ فَقُلْتُ يَا رَسُولَ اللهِ إِنَّ هَذَا خَالَفَ قِرَاءَتِي فِي السُّورَةِ الَّتِي عَلَّمْتَنِي فَقَالَ رَسُولُ اللهِ ﷺ «اقْرَأْ يَا أُبَيُّ» فَقَرَأْتُهَا فَقَالَ لِي رَسُولُ اللهِ ﷺ «أَحْسَنْتَ» ثُمَّ قَالَ لِلرَّجُلِ «اقْرَأْ» فَخَالَفَ قِرَاءَتِي فَقَالَ لَهُ رَسُولُ اللهِ ﷺ «أَحْسَنْتَ» ثُمَّ قَالَ رَسُولُ اللهِ ﷺ «يَا أُبَيُّ إِنَّهُ قَدْ أُنْزِلَ عَلَى سَبْعَةِ أَحْرُفٍ كُلِّهِنَّ شَافٍ كَافٍ» قَالَ أَبُو عَبْدِ الرَّحْمَنِ مَعْقِلُ بْنُ عُبَيْدِ اللهِ لَيْسَ بذَاكَ الْقَوِيِّ