Anas is reported to have said: Four persons collected the Qur'an during the lifetime of Allah's Messenger (ﷺ) and all of them were Ansar: Mu'adh bin Jabal, Ubayy bin Ka'b, Zaid bin Thabit, Abu Zaid. Qatada said: Anas, who was Abu Zaid? He said: He was one of my uncles.
Hadith Referenceصحيح مسلم / كتاب فضائل الصحابة / 2465
Hammam said: I said to Anas bin Malik (RA): Who collected the Qur'an during the lifetime of Allah's Messenger (ﷺ) ? He said: Four (persons), all of them belonging to Ansar: Ubayy bin Ka'b, Mu'adh bin Jabal, Zaid bin Thabit and a person from the Ansar whose Kunya was Abu Zaid.
Hadith Referenceصحيح مسلم / كتاب فضائل الصحابة / 2465
Anas bin Malik (RA) reported that Allah's Messenger (ﷺ) said to Ubayy: Verily Allah, the Exalted and Glorious, has commanded me to recite the Qur'an to you, whereupon he said: (Has) Allah mentioned my name to you? He said: Allah has mentioned your name to me. Thereupon he began to shed tears (of joy)
Hadith Referenceصحيح مسلم / كتاب فضائل الصحابة / 799
Anas bin Malik (RA) reported that Allah's Messenger (ﷺ) said to Ubayy bin Ka'b: I have been commanded to recite to you the Sura (al- Bayyinah) which opens with these words (Lam Yakunil-ladhiyna Kafaruu) He said: Has he mentioned to you my name? He said: Yes; thereupon he shed tears of joy.
Hadith Referenceصحيح مسلم / كتاب فضائل الصحابة / 799