Sahih Muslim | Book 30 | Hadith Number 5720

Narrated by Anas b. Malik
Anas b. Malik reported: I served the Messenger of Allah (may peace be upon him) for ten years, and, by Allah, he never said to me any harsh word, and he never said to me about a thing as to why I had done that and as to why I had not done that. Abu Rabi' has made this addition (in this narration): "The work which a servant should do." There is no mention of his words "By Allah".