Sayyiduna Anas (may Allah be pleased with him) says that in the time of the Noble Prophet (peace and blessings be upon him), there were four men who had memorized the Qur'an, and all of them were Ansari. Ubayy bin Ka'b, Mu'adh bin Jabal, Abu Zayd, and Zayd bin Thabit. Sayyiduna Anas was asked, "Who was Abu Zayd?" He replied, "He was one of my uncles."