It is narrated from Hazrat Zaid bin Thabit (may Allah be pleased with him) that when we were preparing the copies of the Mushaf, I could not find one verse of Surah Ahzab among them which I used to hear the Prophet Muhammad (peace and blessings be upon him) recite. I searched for it and found it only with Hazrat Khuzaymah bin Thabit Ansari (may Allah be pleased with him), whose testimony the Prophet Muhammad (peace and blessings be upon him) had declared equal to the testimony of two men. And that verse was: "Among the believers are men who have been true to their covenant with Allah." Then I included it in its Surah as part of the Mushaf.