They made a mention of Ibn Mas'ud before 'Abdullah b. Amr, whereupon he said: He is a person whose love is always fresh in my heart after I heard Allah's Messenger (ﷺ) as saying: Learn the recita- tion of the Qur'an from four persons: from Ibn Mas'ud, Salim, the ally of Abu Hudhaifa, Ubayy b. Ka'b, Mu'adh b. Jabal.
Ubaidullah b. Mu'adh reported it on the authority of his father Shu'ba with the same chain of transmitters and he made this addition. He made a mention of these two names but I do not know whose name he mentioned first.
Four persons collected the Qur'an during the lifetime of Allah's Messenger (ﷺ) and all of them were Ansar: Mu'adh b. Jabal, Ubayy b. Ka'b, Zaid b. Thabit, Abu Zaid. Qatada said: Anas, who was Abu Zaid? He said: He was one of my uncles.
I said to Anas b. Malik: Who collected the Qur'an during the lifetime of Allah's Messenger (ﷺ)? He said: Four (persons), all of them belonging to Ansir: Ubayy b. Ka'b, Mu'adh b. Jabal, Zaid b. Thabit and a person from the Ansar whose Kunya was Abu Zaid.