Hadith on Ahruf: Quran has been revealed in seven dialects

Umar ibn al-Khattab reported: I heard Hisham ibn Hakim reciting the Surat al-Furqan in a way different from how I recited it and how it was taught to me by the Messenger of Allah, peace and blessings be upon him. I was about to argue with him, but then I waited until he finished and I tied his shirt around his neck and took him to the Prophet. I said, “Indeed, I heard this man recite in a way different from what you taught me!” The Prophet said to me, “Bring him to me.” Then, Prophet said to him, “Recite.” He recited and the Prophet said, “As it has been revealed.” Then, the Prophet said to me, “Recite.” I recited and the Prophet said, “As it has been revealed. Verily, the Quran has been revealed in seven dialects. Recite whichever of them you find easy.

Source: Ṣaḥīḥ al-Bukhārī 2287, Ṣaḥīḥ Muslim 818

Grade: Muttafaqun Alayhi (authenticity agreed upon) according to Al-Bukhari and Muslim

عن عُمَر بْن الْخَطَّابِ قال سَمِعْتُ هِشَامَ بْنَ حَكِيمِ بْنِ حِزَامٍ يَقْرَأُ سُورَةَ الْفُرْقَانِ عَلَى غَيْرِ مَا أَقْرَؤُهَا وَكَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَقْرَأَنِيهَا وَكِدْتُ أَنْ أَعْجَلَ عَلَيْهِ ثُمَّ أَمْهَلْتُهُ حَتَّى انْصَرَفَ ثُمَّ لَبَّبْتُهُ بِرِدَائِهِ فَجِئْتُ بِهِ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقُلْتُ إِنِّي سَمِعْتُ هَذَا يَقْرَأُ عَلَى غَيْرِ مَا أَقْرَأْتَنِيهَا فَقَالَ لِي أَرْسِلْهُ ثُمَّ قَالَ لَهُ اقْرَأْ فَقَرَأَ قَالَ هَكَذَا أُنْزِلَتْ ثُمَّ قَالَ لِي اقْرَأْ فَقَرَأْتُ فَقَالَ هَكَذَا أُنْزِلَتْ إِنَّ الْقُرْآنَ أُنْزِلَ عَلَى سَبْعَةِ أَحْرُفٍ فَاقْرَءُوا مِنْهُ مَا تَيَسَّرَ

2287 صحيح البخاري كتاب الخصومات باب كلام الخصوم بعضهم في بعض

818 صحيح مسلم كتاب صلاة المسافرين وقصرها باب بيان أن القرآن على سبعة أحرف وبيان معناه