Abu Nadrah said: I asked Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him), "Will you not write for us? We cannot memorize." He replied: "No, we will never write for you, nor will we let this written material become like the Qur'an. Yes, memorize the ahadith from us just as we used to memorize from the Messenger of Allah (peace and blessings be upon him)."