Sahih Bukhari Volume 6, Book 61, Hadith Number 526.

Narrated By 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.