Qatadah (may Allah have mercy on him) said: I heard Anas (may Allah be pleased with him) saying that in the time of the Messenger of Allah (peace and blessings be upon him) four men collected the Qur'an: Ubayy bin Ka'b, Mu'adh bin Jabal, Zayd bin Thabit and Abu Zayd (may Allah be pleased with them). He said: I said to Anas (may Allah be pleased with him): Who is Abu Zayd? Anas (may Allah be pleased with him) said: One of my paternal uncles.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الفرائض / 12192