Sahih Bukhari
Prophetic Commentary on the Quran (Tafseer of the Prophet (PBUH))
Volume: 006 / Book Number: 060 / Hadith Number: 307
Narrated Zaid bin Thabit:
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 Allah's Apostle reading. Finally I did not find it with anybody except Khuzaima Al-Ansari, whose witness was considered by Allah's Apostle 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.'