Four persons collected the Qur'an during the lifetime of Messenger of Allah 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.  

سَمِعْتُ أَنَسًا يَقُولُ جَمَعَ الْقُرْآنَ عَلَى عَهْدِ رَسُولِ اللَّهِ ﷺ أَرْبَعَةٌ كُلُّهُمْ مِنَ الأَنْصَارِ مُعَاذُ بْنُ جَبَلٍ وَأُبَىُّ بْنُ كَعْبٍ وَزَيْدُ بْنُ ثَابِتٍ وَأَبُو زَيْدٍ قَالَ قَتَادَةُ قُلْتُ لأَنَسٍ مَنْ أَبُو زَيْدٍ قَالَ أَحَدُ عُمُومَتِي  

I said to Anas b. Malik: Who collected the Qur'an during the lifetime of Messenger of Allah 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.  

قُلْتُ لأَنَسِ بْنِ مَالِكٍ مَنْ جَمَعَ الْقُرْآنَ عَلَى عَهْدِ رَسُولِ اللَّهِ ﷺ قَالَ أَرْبَعَةٌ كُلُّهُمْ مِنَ الأَنْصَارِ أُبَىُّ بْنُ كَعْبٍ وَمُعَاذُ بْنُ جَبَلٍ وَزَيْدُ بْنُ ثَابِتٍ وَرَجُلٌ مِنَ الأَنْصَارِ يُكْنَى أَبَا زَيْدٍ  

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)  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لأُبَىٍّ إِنَّ اللَّهَ ﷻ أَمَرَنِي أَنْ أَقْرَأَ عَلَيْكَ قَالَ آللَّهُ سَمَّانِي لَكَ قَالَ اللَّهُ سَمَّاكَ لِي قَالَ فَجَعَلَ أُبَىٌّ يَبْكِي  

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.  

قَالَ رَسُولُ اللَّهِ ﷺ لأُبَىِّ بْنِ كَعْبٍ إِنَّ اللَّهَ أَمَرَنِي أَنْ أَقْرَأَ عَلَيْكَ { لَمْ يَكُنِ الَّذِينَ كَفَرُوا} قَالَ وَسَمَّانِي قَالَ نَعَمْ قَالَ فَبَكَى  

This hadith has been narrated on the authority of Anas through another chain of transmitters.  

قَالَ رَسُولُ اللَّهِ ﷺ لأُبَىٍّ بِمِثْلِهِ