Narrated Kharija bin Zaid: Zaid bin Thabit said, "When the Quran was compiled from various written manuscripts, one of the Verses of Surat AlAhzab was missing which I used to hear Allah's Apostle reciting. I could not find it except with Khuzaima bin Thabjt Al-Ansari, whose witness Allah's Apostle 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)

— Sahih Bukhari, Volume 4, Book 52: Fighting for the Cause of Allah (Jihaad), Hadith #62