وَعَنِ ابْنِ مَسْعُودٍ رَضِيَ اللَّهُ عَنْهُ قَالَ: سَمِعْتُ رَجُلًا قَرَأَ وَسَمِعْتُ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقْرَأُ خِلَافَهَا فَجِئْتُ بِهِ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَأَخْبَرْتُهُ فَعَرَفْتُ فِي وَجهه الْكَرَاهِيَة فَقَالَ: «كِلَاكُمَا مُحْسِنٌ فَلَا تَخْتَلِفُوا فَإِنَّ مَنْ كَانَ قبلكُمْ اخْتلفُوا فهلكوا» . رَوَاهُ البُخَارِيّ

I heard a man who recited, and as I had heard the Prophet reciting differently I took him to the Prophet and told him and noticed that he gave a disapproving look. He then said, “Both of you are doing it well, so do not disagree, for your predecessors disagreed and perished.” Bukhārī transmitted it.