Maliks Muwatta Book 47, Hadith Number 11.
Section : Anger.
Malik related to me from Ibn Shihab from Humayd ibn Abd ar-Rahman ibn Awf that a man came to the Messenger of Allah, may Allah bless him and grant him peace, and said, “Messenger of Allah, teach me some words which I can live by. Do not make them too much for me, lest I forget.” The Messenger of Allah, may Allah bless him and grant him peace, said, “Do not be angry.”