English Translation
Narrated Qatada: Anas said, "The Quran was collected in the lifetime of the Prophet by four (men), all of whom were from the Ansar: Ubai, Muadh bin Jabal, Abu Zaid and Zaid bin Thabit." I asked Anas, "Who is Abu Zaid?" He said, "One of my uncles."
This hadith is from Sahih al-Bukhari, the most rigorously authenticated collection in Islamic scholarship. No editorial opinion is added.