Musnad Abu Ya'la al-Mawsili 117:93

Abu al-Rabi' narrated to us, Hammad narrated to us, Thabit narrated to us, from Anas, who said: I served the Messenger of Allah (may Allah bless him and grant him peace) for ten years. He never once said "Uff" to me, nor did he say regarding anything a servant had done, "Why did you do such and such?" or "Why did you not do such and such?"