I heard Hisham bin Al-Hakim reciting Surat Al-Furqan during the lifetime of Messenger of Allah ﷺ. I listened to his recitation and noticed that he recited it in several different ways which Messenger of Allah ﷺ had not taught me. So I was about to jump over him during his Salat (prayer) but I waited till he finished his Salat (prayer) whereupon I put, either his upper garment or my upper garment around his neck and seized him by it and asked him, "Who has taught you this Surah?" He replied: "Messenger of Allah ﷺ has taught it to me." I said (to him), "You have told a lie! By Allah, Messenger of Allah ﷺ has taught me this Surah which I have heard you reciting." So I dragged him to the Messenger of Allah ﷺ. I said: "O Messenger of Allah I have heard this man reciting Surat Al-Furqan in a way in which you have not taught me, and you did teach me Surah Al-Furqan." On that Messenger of Allah ﷺ said, "O 'Umar, release him! Recite, O Hisham". So Hisham recited before him in the way as I heard him reciting. Messenger of Allah ﷺ said, "It has been revealed like this." Then Messenger of Allah ﷺ said, "Recite, O 'Umar" So recited it. The Prophet ﷺ said, "It has been revealed like this." And then he added, "This Qur'an has been revealed to be recited in seven different ways, so recite it whichever way is easier for you."
سَمِعْتُ هِشَامَ بْنَ حَكِيمٍ يَقْرَأُ سُورَةَ الْفُرْقَانِ فِي حَيَاةِ رَسُولِ اللَّهِ ﷺ فَاسْتَمَعْتُ لِقِرَاءَتِهِ فَإِذَا هُوَ يَقْرَؤُهَا عَلَى حُرُوفٍ كَثِيرَةٍ لَمْ يُقْرِئْنِيهَا رَسُولُ اللَّهِ ﷺ كَذَلِكَ فَكِدْتُ أُسَاوِرُهُ فِي الصَّلاَةِ فَانْتَظَرْتُهُ حَتَّى سَلَّمَ ثُمَّ لَبَّبْتُهُ بِرِدَائِهِ أَوْ بِرِدَائِي فَقُلْتُ مَنْ أَقْرَأَكَ هَذِهِ السُّورَةَ قَالَ أَقْرَأَنِيهَا رَسُولُ اللَّهِ ﷺ قُلْتُ لَهُ كَذَبْتَ فَوَاللَّهِ إِنَّ رَسُولَ اللَّهِ ﷺ أَقْرَأَنِي هَذِهِ السُّورَةَ الَّتِي سَمِعْتُكَ تَقْرَؤُهَا فَانْطَلَقْتُ أَقُودُهُ إِلَى رَسُولِ اللَّهِ ﷺ فَقُلْتُ يَا رَسُولَ اللَّهِ إِنِّي سَمِعْتُ هَذَا يَقْرَأُ بِسُورَةِ الْفُرْقَانِ عَلَى حُرُوفٍ لَمْ تُقْرِئْنِيهَا وَأَنْتَ أَقْرَأْتَنِي سُورَةَ الْفُرْقَانِ فَقَالَ رَسُولُ اللَّهِ ﷺ أَرْسِلْهُ يَا عُمَرُ اقْرَأْ يَا هِشَامُ فَقَرَأَ عَلَيْهِ الْقِرَاءَةَ الَّتِي سَمِعْتُهُ يَقْرَؤُهَا قَالَ رَسُولُ اللَّهِ ﷺ هَكَذَا أُنْزِلَتْ ثُمَّ قَالَ رَسُولُ اللَّهِ ﷺ اقْرَأْ يَا عُمَرُ فَقَرَأْتُ فَقَالَ هَكَذَا أُنْزِلَتْ ثُمَّ قَالَ إِنَّ هَذَا الْقُرْآنَ أُنْزِلَ عَلَى سَبْعَةِ أَحْرُفٍ فَاقْرَءُوا مَا تَيَسَّرَ مِنْهُ