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}