مختصر صحيح بخاري
Mukhtasar Sahih Bukhari
Book of Manners
Avoiding anger.
Narrated by Sayyiduna Abu Huraira (may Allah be pleased with him): The Messenger of Allah (peace and blessings of Allah be upon him) said: "The strong man is not the one who defeats others in wrestling, but the strong man is the one who controls himself at the time of anger."