From Sahih Bukhari (Hadith 5004):
Narrated Anas bin Malik:When the Prophet (ﷺ) 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
Reference: Bukhari 5004