Mishkat al-Masabih 2221
Anas b. Mālik told of Hudhaifa b. al-Yamān coming to ‘Uthmān after having led the Syrians along with the ‘Irāqīs at the conquest of Armenia and Azerbaijan:
Being alarmed at their difference in reading the Qur’ān he said to ‘Uthmān, “Commander of the faithful, set this people right before they disagree about the Book in the manner of the Jews and the Christians.” ‘Uthmān therefore sent a message to Hafsa asking her to send the sheets to him so that they might make copies of them, after which he would return them to her. Hafsa sent them to ‘Uthmān and he commanded Zaid b. Thābit, ‘Abdallāh b. az-Zubair, Sa'īd b. al-‘Ās and ‘Abdallāh b. al-Hārith b. Hishām who made copies of them. ‘Uthmān gave instructions to the three members of Quraish that when they and Zaid b. Thābit disagreed about anything in the Qur’ān they were to write in the dialect of Quraish, for it came down only in their dialect. They did so, and when they had made several copies of the sheets ‘Uthmān returned the sheets to Hafsa. He then sent a copy of those which they had transcribed to every region, giving orders that every sheet or volume which contained a part of the Qur’ān in different form should be burned. Ibn Shihāb said he was told by Khārija b. Zaid b. Thābit that he heard Zaid b. Thābit say that when they transcribed the Qur’ān he failed to find a verse in al-Ahzāb which he had heard God’s messenger reciting. He therefore sought it and found it with Khuzaima b. Thābit al-Ansārī, “Among the believers are men who have been true to the covenant they made with God” (Qur’ān, 33:23). They then added it to its sūra in the copy of the Qur’ān. 

Bukhārī transmit­ted it.
وَعَنْ أَنَسِ بْنِ مَالِكٍ: أَنَّ حُذَيْفَةَ بْنَ الْيَمَانِ قَدِمَ عَلَى عُثْمَانَ وَكَانَ يُغَازِي أَهْلَ الشَّامِ فِي فَتْحِ أَرْمِينِيَّةَ وَأَذْرَبِيجَانَ مَعَ أَهْلِ الْعِرَاقِ فَأَفْزَعَ حُذَيْفَةَ اخْتِلَافُهُمْ فِي الْقِرَاءَةِ فَقَالَ حُذَيْفَةُ لِعُثْمَانَ يَا أَمِيرَ الْمُؤْمِنِينَ أَدْرِكْ هَذِهِ الْأُمَّةَ قَبْلَ أَنْ يَخْتَلِفُوا فِي الْكِتَابِ اخْتِلَافَ الْيَهُودِ وَالنَّصَارَى فَأَرْسَلَ عُثْمَانُ إِلَى حَفْصَةَ أَنْ أَرْسِلِي إِلَيْنَا بِالصُّحُفِ نَنْسَخُهَا فِي الْمَصَاحِفِ ثُمَّ نَرُدُّهَا إِلَيْكِ فَأَرْسَلَتْ بِهَا حَفْصَةُ إِلَى عُثْمَانَ فَأَمَرَ زَيْدَ بْنَ ثَابِتٍ وَعَبْدَ اللَّهِ بْنَ الزبير وَسَعِيد بن الْعَاصِ وَعبد الرَّحْمَن بْنَ الْحَارِثِ بْنِ هِشَامٍ فَنَسَخُوهَا فِي الْمَصَاحِفِ وَقَالَ عُثْمَانُ لِلرَّهْطِ الْقُرَشِيِّينَ الثَّلَاثِ إِذَا اخْتَلَفْتُمْ فِي شَيْءٍ مِنَ الْقُرْآنِ فَاكْتُبُوهُ بِلِسَانِ قُرَيْشٍ فَإِنَّمَا نَزَلَ بِلِسَانِهِمْ فَفَعَلُوا حَتَّى إِذَا نَسَخُوا الصُّحُفَ فِي الْمَصَاحِفِ رَدَّ عُثْمَانُ الصُّحُفَ إِلَى حَفْصَةَ وَأَرْسَلَ إِلَى كُلِّ أُفُقٍ بِمُصْحَفٍ مِمَّا نَسَخُوا وَأَمَرَ بِمَا سِوَاهُ مِنَ الْقُرْآنِ فِي كُلِّ صَحِيفَةٍ أَوْ مُصْحَفٍ أَنْ يُحْرَقَ قَالَ ابْن شهَاب وَأَخْبرنِي خَارِجَة بن زيد بن ثَابت سَمِعَ زَيْدَ بْنَ ثَابِتٍ قَالَ فَقَدْتُ آيَةً مِنَ الْأَحْزَابِ حِينَ نَسَخْنَا الْمُصْحَفَ قَدْ كُنْتُ أَسْمَعُ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقْرَأُ بِهَا فَالْتَمَسْنَاهَا فَوَجَدْنَاهَا مَعَ خُزَيْمَةَ بْنِ ثَابِتٍ الْأَنْصَارِيِّ (مِنَ الْمُؤْمِنِينَ رِجَالٌ صَدَقُوا مَا عَاهَدُوا الله عَلَيْهِ)
فَأَلْحَقْنَاهَا فِي سُورَتِهَا فِي الْمُصْحَفِ. رَوَاهُ الْبُخَارِيُّ