Musnad Ahmad 32:1091

'Abd al-Razzaq narrated to us, Ma'mar narrated to us, from Thabit, from Anas, who said: "I served the Messenger of Allah, may Allah bless him and grant him peace, for ten years. By Allah, he never once insulted me, nor did he ever say to me, 'Uff!' He never said to me regarding anything I did, 'Why did you do that?' nor regarding anything I did not do, 'Why did you not do that?'"