It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "The strong man is not the one who quickly throws (someone) down; rather, the strong man is the one who controls himself at the time of anger."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشهادات / 21126