(8) باب الْقُرَّاءِ مِنْ أَصْحَابِ النَّبِيِّ صلى الله عليه وسلم
Narrated Qatada:
I asked Anas bin Malik: "Who collected the Qur'an at the time of the Prophet (ﷺ) ?" He replied, "Four, all of whom were from the Ansar: Ubai bin Ka`b, Mu`adh bin Jabal, Zaid bin Thabit and Abu Zaid."
Reference: Sahih al-Bukhari 5003
In-book reference: Book 66, Hadith 25
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 6, Book 61, Hadith 525