What made the witness of Khuza`ima bin Thabjt Al-Ansari so valuable to the Prophet Muhammad (saw) that Allah's Apostle also regarded it as equal to the witness of two men?
 Narrated Kharija bin Zaid:                     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 Allah's Apostle reciting. I could not find it except with Khuza`ima 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)