Volume 7 · Book 61 · Hadith 526
Narrated Anas bin Malik: When the Prophet died, none had collected the Qur'an but four persons;: Abu Ad-Darda'. Mu'adh bin Jabal, Zaid bin Thabit and Abu Zaid. We were the inheritor (of Abu Zaid) as he had no offspring .
— Sahih Bukhari, Volume 7, Book 61: Virtues of the Qur'an, Hadith #526