It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The strong one is not the one who quickly throws others down." A Companion asked: Then who is the strong one? He (peace and blessings be upon him) said: "The one who keeps control of himself at the time of anger."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشهادات / 21085