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.
Reference: Sahih Muslim 2465 a In-book : Book 44, Hadith 170 USC-MSA web (English) : Book 31, Hadith 6029 (deprecated)
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