Sahih Muslim #6340 · The Book of the Merits of the Companions

Sahih MuslimAnas is reported to have said
Sahih Muslim · Book 44 · The Book of the Merits of the Companions
Sahih Muslim · كتاب 44 · كتاب فضائل الصحابة
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.
حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، حَدَّثَنَا أَبُو دَاوُدَ، حَدَّثَنَا شُعْبَةُ، عَنْ قَتَادَةَ، قَالَ سَمِعْتُ أَنَسًا، يَقُولُ جَمَعَ الْقُرْآنَ عَلَى عَهْدِ رَسُولِ اللَّهِ صلى الله عليه وسلم 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 ‏.‏
Reference : Sahih Muslim 6340In-book reference : Book 44, Hadith 170