Abdur Rahman bin Mahdi says: I heard Imam Malik bin Anas, may Allah have mercy on him, say that Ibn Shihab Zuhri narrated a hadith and left. I met him on the way and held his reins, then I said: O Abu Bakr! Please narrate to me again the same hadith which you have already narrated. He said: Do you want to hear it again? I said: Did you not listen to it again? He said: No. I said: And did you not write it down either? He said: No.