Zaid bin Thabit said, "When the Qur'an was compiled from various written manuscripts, one of the Verses of Surat Al-Ahzab was missing which I used to hear Messenger of Allah ﷺ reciting. I could not find it except with Khuzaʿima bin Thabjt Al-Ansari, whose witness Messenger of Allah ﷺ regarded as equal to the witness of two men. And the Verse was:-- "Among the believers are men who have been true to what they covenanted with Allah." (33.23)  

نَسَخْتُ الصُّحُفَ فِي الْمَصَاحِفِ فَفَقَدْتُ آيَةً مِنْ سُورَةِ الأَحْزَابِ كُنْتُ أَسْمَعُ رَسُولَ اللَّهِ ﷺ يَقْرَأُ بِهَا فَلَمْ أَجِدْهَا إِلاَّ مَعَ خُزَيْمَةَ بْنِ ثَابِتٍ الأَنْصَارِيِّ الَّذِي جَعَلَ رَسُولُ اللَّهِ ﷺ شَهَادَتَهُ شَهَادَةَ رَجُلَيْنِ وَهْوَ قَوْلُهُ {مِنَ الْمُؤْمِنِينَ رِجَالٌ صَدَقُوا مَا عَاهَدُوا اللَّهَ عَلَيْهِ}  

When we collected the fragramentary manuscripts of the Qur'an into copies, I missed one of the Verses of Surat al-Ahzab which I used to hear Messenger of Allah ﷺ reading. Finally I did not find it with anybody except Khuzaʿima Al-Ansari, whose witness was considered by Messenger of Allah ﷺ equal to the witness of two men. (And that Verse was:) 'Among the believers are men who have been true to their covenant with Allah.'  

لَمَّا نَسَخْنَا الصُّحُفَ فِي الْمَصَاحِفِ فَقَدْتُ آيَةً مِنْ سُورَةِ الأَحْزَابِ كُنْتُ أَسْمَعُ رَسُولَ اللَّهِ ﷺ يَقْرَؤُهَا لَمْ أَجِدْهَا مَعَ أَحَدٍ إِلاَّ مَعَ خُزَيْمَةَ الأَنْصَارِيِّ الَّذِي جَعَلَ رَسُولُ اللَّهِ ﷺ شَهَادَتَهُ شَهَادَةَ رَجُلَيْنِ {مِنَ الْمُؤْمِنِينَ رِجَالٌ صَدَقُوا مَا عَاهَدُوا اللَّهَ عَلَيْهِ}  

'Among the Believers are men who have been true in their covenant with Allah.' (33.23)  

فَقَدْتُ آيَةً مِنَ الأَحْزَابِ حِينَ نَسَخْنَا الْمُصْحَفَ قَدْ كُنْتُ أَسْمَعُ رَسُولَ اللَّهِ ﷺ يَقْرَأُ بِهَا فَالْتَمَسْنَاهَا فَوَجَدْنَاهَا مَعَ خُزَيْمَةَ بْنِ ثَابِتٍ الأَنْصَارِيِّ {مِنَ الْمُؤْمِنِينَ رِجَالٌ صَدَقُوا مَا عَاهَدُوا اللَّهَ عَلَيْهِ} فَأَلْحَقْنَاهَا فِي سُورَتِهَا فِي الْمُصْحَفِ  

[Machine] When the Qur'ans were written, I lost a verse that I used to hear from the Messenger of Allah ﷺ . I found it with Khuzaymah al-Ansari from the believers, who said, "Men who have fulfilled their covenant with Allah." [Quran 33:23] until "for another." [Quran 33:23] Khuzaymah, also known as Dhu al-Shahadatayn, was granted the testimony of his testimony by the Messenger of Allah ﷺ with the testimony of two men. Al-Zuhri said that he was killed on the day of Siffin along with Ali.  

لَمَّا كُتِبَتِ الْمَصَاحِفُ فَقَدْتُ آيَةً كُنْتُ أَسْمَعُهَا مِنْ رَسُولِ اللهِ ﷺ فَوَجَدْتُهَا عِنْدَ خُزَيْمَةَ الْأَنْصَارِيِّ {مِنَ الْمُؤْمِنِينَ رِجَالٌ صَدَقُوا مَا عَاهَدُوا اللهَ عَلَيْهِ} [الأحزاب 23] إِلَى {تَبْدِيلًا} [الأحزاب 23] قَالَ فَكَانَ خُزَيْمَةُ يُدْعَى ذَا الشَّهَادَتَيْنِ أَجَازَ رَسُولُ اللهِ ﷺ شَهَادَتَهُ بِشَهَادَةِ رَجُلَيْنِ قَالَ الزُّهْرِيُّ وَقُتِلَ يَوْمَ صِفِّينَ مَعَ عَلِيٍّ  

[Machine] I heard the Messenger of Allah (Peace be upon him) recite it, so I sought it and found it with Khuzaymah ibn Thabit al-Ansari: "Among the believers are men who have been true to their covenant with Allah." So I added it to its Surah in the Mushaf.  

أَسْمَعُ رَسُولَ اللهِ ﷺ يَقْرَأُهَا فَالْتَمَسْتُهَا فَوَجَدْتُهَا مَعَ خُزَيْمَةَ بْنِ ثَابِتٍ الْأَنْصَارِيِّ {مِنَ الْمُؤْمِنِينَ رِجَالٌ صَدَقُوا مَا عَاهَدُوا اللهَ عَلَيْهِ} فَأَلْحَقْتُهَا فِي سُورَتِهَا مِنَ الْمُصْحَفِ