In the name of Allah, Most Gracious, Most Merciful.
Abu Hurairah (May Allah be pleased with him) reported: The Messenger of Allah (May Allah exalt his mention and protect him from imperfection) said: “The strong man is not one who is good at wrestling, but the strong man is one who controls himself in a fit of rage.” (Al-Bukhari and Muslim).
Riyaadiss-Saliheen (The Meadows of the Righteous)
By Imam An Nawawi
Chapter 3, Page 20, No 45