عَنْ أَبِي هُرَيْرَةَ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ لَيْسَ الشَّدِيدُ بِالصُّرَعَةِ إِنَّمَا الشَّدِيدُ الَّذِي يَمْلِكُ نَفْسَهُ عِنْدَ الْغَضَبِ
Abu Huraira, may Allah be pleased with him, reported: The Messenger of Allah, peace and blessings be upon him, said, “The strong are not the best wrestlers. Verily, the strong are only those who control themselves when they are angry.”
Source: Sahih Bukhari & Sahih Muslim