Yahya related to me from Malik from Ibn Shihab from Said ibn al-Musayyab from Abu Hurayra that the Messenger of Allah, may Allah blesshim and grant him peace, said, "A strong person is not the person whothrows his adversaries to the ground. A strong person is the personwho contains himself when he is angry."
USC-MSA web (English) reference: Book 47, Hadith 12
Arabic reference: Book 47, Hadith 1647