Urwah bin Az-Zubair narrated that Al-Miswar bin Makhramah and AbdurRahman bin Abdul-Qari told him that:

They heard Umar bin Al-Khattab say: "I heard Hisham bin Hakim bin Hizam reciting Surat Al-Furqan during the lifetime of the Messenger of Allah ﷺ, so I listened to his recitation and he was reciting it in a way that the Messenger of Allah ﷺ had not taught me. I was about to jump on him while he was praying, but I waited patiently until he said the Salam (at the end of the prayer). When he had said the Salam I grabbed him by his garment and said: 'Who taught you this Surah that I heard you reciting?' He said: 'The Messenger of Allah ﷺ taught me it. I said: 'You are lying, by Allah! The Messenger of Allah ﷺ is the one who taught me this Surah that I heard you reciting.' I took him to the Messenger of Allah ﷺ and said: 'O Messenger of Allah, I heard this man reciting Surat Al-Furqan in a way that you did not teach me, but you taught me Surat Al-Furqan.' The Messenger of Allah ﷺ said:' Let him go, O Umar. Recite, O Hisham.' So I recited it to him in the way that I had heard him recite. The Messenger of Allah ﷺ said: 'It was revealed like this.' Then the Messenger of Allah ﷺ said: 'Recite, O Umar.' So I recited it in the way that he had taught me. The Messenger of Allah ﷺ said: 'It was revealed like this.' Then the Messenger of Allah ﷺ said: 'This Quran has been revealed to be recited in seven different modes, so recite as much of the Quran as may be easy for you.'"

أَخْبَرَنَا يُونُسُ بْنُ عَبْدِ الأَعْلَى، قَالَ حَدَّثَنَا ابْنُ وَهْبٍ، قَالَ أَخْبَرَنِي يُونُسُ، عَنِ ابْنِ شِهَابٍ، قَالَ أَخْبَرَنِي عُرْوَةُ بْنُ الزُّبَيْرِ، أَنَّ الْمِسْوَرَ بْنَ مَخْرَمَةَ، وَعَبْدَ الرَّحْمَنِ بْنَ عَبْدٍ الْقَارِيَّ، أَخْبَرَاهُ أَنَّهُمَا، سَمِعَا عُمَرَ بْنَ الْخَطَّابِ، يَقُولُ 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 فَكِدْتُ أُسَاوِرُهُ فِي الصَّلاَةِ فَتَصَبَّرْتُ حَتَّى سَلَّمَ فَلَمَّا سَلَّمَ لَبَّبْتُهُ بِرِدَائِهِ فَقُلْتُ مَنْ أَقْرَأَكَ هَذِهِ السُّورَةَ الَّتِي سَمِعْتُكَ تَقْرَؤُهَا فَقَالَ أَقْرَأَنِيهَا رَسُولُ اللَّهِ ﷺ . فَقُلْتُ كَذَبْتَ . فَوَاللَّهِ إِنَّ رَسُولَ اللَّهِ ﷺ هُوَ أَقْرَأَنِي هَذِهِ السُّورَةَ الَّتِي سَمِعْتُكَ تَقْرَؤُهَا فَانْطَلَقْتُ بِهِ أَقُودُهُ إِلَى رَسُولِ اللَّهِ ﷺ فَقُلْتُ يَا رَسُولَ اللَّهِ إِنِّي سَمِعْتُ هَذَا يَقْرَأُ سُورَةَ 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 الْقِرَاءَةَ الَّتِي أَقْرَأَنِي قَالَ رَسُولُ اللَّهِ ﷺ " هَكَذَا أُنْزِلَتْ " . ثُمَّ قَالَ رَسُولُ اللَّهِ ﷺ " إِنَّ هَذَا الْقُرْآنَ أُنْزِلَ عَلَى سَبْعَةِ أَحْرُفٍ { فَاقْرَءُوا مَا تَيَسَّرَ مِنْهُ } " .