Musnad Abu Ya'la al-Mawsili 116:41

Ahmad narrated to us, Abu Dawud narrated to us, he said: Shu'bah informed us, from Qatadah, who heard Anas saying: The Quran was collected during the time of the Messenger of Allah, may Allah bless him and grant him peace, by four, all of whom were from the Ansar: Mu'adh ibn Jabal, Ubayy ibn Ka'b, Zayd ibn Thabit, and Abu Zayd. Qatadah said: I said to Anas, "Who is Abu Zayd?" He said, "One of my paternal uncles."