Musannaf Ibn Abi Shayba 17:1138

Abu Bakr narrated to us, he said: Abu Usamah narrated to us, from Kahmas, from Abu Nadrah, who said: We said to Abu Sa'id al-Khudri, "If only you would write down the hadith for us." He said, "We will not write it down for you. Take from us just as we took from our Prophet."