I heard Hisham bin Hakim bin Hizam reciting Surat-al-Furqan during the lifetime of Messenger of Allah ﷺ, and I listened to his recitation and noticed that he recited it in several ways which Messenger of Allah ﷺ had not taught me. So I was on the point of attacking him in the prayer, but I waited till he finished his prayer, and then I seized him by the collar and said, "Who taught you this Surah which I have heard you reciting?" He replied, "Messenger of Allah ﷺ taught it to me." I said, "You are telling a lie; By Allah! Messenger of Allah ﷺ taught me (in a different way) this very Surah which I have heard you reciting." So I took him, leading him to Messenger of Allah ﷺ and said, "O Messenger of Allah ﷺ! I heard this person reciting Surat-al-Furqan in a way that you did not teach me, and you have taught me Surat-al-Furqan." The Prophet said, "O Hisham, recite!" So he recited in the same way as I heard him recite it before. On that Messenger of Allah ﷺ said, "It was revealed to be recited in this way." Then Messenger of Allah ﷺ said, "Recite, O ʿUmar!" So I recited it as he had taught me. Messenger of Allah ﷺ then said, "It was revealed to be recited in this way." Allah" Apostle added, "The Qur'an has been revealed to be recited in several different ways, so recite of it that which is easier for you." (Using translation from Bukhārī 5041)
سَمِعْتُ هِشَامَ بْنَ حَكِيمِ يَقْرَأُ سُورَةَ الْفُرْقَانِ فِي حَيَاةِ رَسُولِ اللهِ ﷺ فَاسْتَمَعْتُ لِقِرَاءَتِهِ فَإِذَا هُوَ يَقْرَأُ عَلَى حُرُوفٍ كَثِيرَةٍ لَمْ يُقْرِئْنِيهَا رَسُولُ اللهِ ﷺ فَكِدْتُ أُسَاوِرُهُ فِي الصَّلَاةِ فَتَصَبَّرْتُ حَتَّى سَلَّمَ فَلَمَّا سَلَّمَ لَبَّبْتُهُ بِرِدَائِهِ فَقُلْتُ مَنْ أَقْرَأَكَ هَذِهِ السُّورَةِ الَّتِي سَمِعْتُكَ تَقْرَؤُهَا؟ قَالَ أَقْرَأَنِيهَا رَسُولُ اللهِ ﷺ فَقُلْتُ كَذَبْتَ فَوَاللهِ إِنَّ رَسُولَ اللهِ ﷺ لَهُوَ أَقْرَأَنِي هَذِهِ السُّورَةَ الَّتِي سَمِعْتُكَ تَقْرَؤُهَا فَانْطَلَقْتُ بِهِ أَقُودُهُ إِلَى رَسُولِ اللهِ ﷺ فَقُلْتُ يَا رَسُولَ اللهِ إِنِّي سَمِعْتُ هَذَا يَقْرَأُ سُورَةَ الْفُرْقَانِ عَلَى حُرُوفٍ لَمْ تُقْرِئْنِيهَا وَأَنْتَ أَقْرَأْتَنِي سُورَةَ الْفُرْقَانِ فَقَالَ رَسُولُ اللهِ ﷺ «أَرْسِلْهُ يَا عُمَرُ اقْرَأْ يَا هِشَامُ» فَقَرَأَ عَلَيْهِ الْقِرَاءَةَ الَّتِي سَمِعْتُهُ يَقْرَؤُهَا قَالَ رَسُولُ اللهِ ﷺ «هَكَذَا أُنْزِلَتْ» ثُمَّ قَالَ رَسُولُ اللهِ ﷺ «اقْرَأْ يَا عُمَرُ» فَقَرَأْتُ الْقِرَاءَةَ الَّتِي أَقْرَأَنِي قَالَ رَسُولُ اللهِ ﷺ «هَكَذَا أُنْزِلَتْ» ثُمَّ قَالَ رَسُولُ اللهِ ﷺ «إِنَّ هَذَا الْقُرْآنَ أُنْزِلَ عَلَى سَبْعَةِ أَحْرُفٍ فَاقْرَءُوا مَا تَيَسَّرَ مِنْهُ»