Sahih al-Bukhari, Hadith 6114 ⓘ
Narrated Abu Huraira: Allah's Messenger said, "The strong is not the one who overcomes the people by his strength, but the strong is the one who controls himself while in anger."
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، أَخْبَرَنَا مَالِكٌ، عَنِ ابْنِ شِهَابٍ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " لَيْسَ الشَّدِيدُ بِالصُّرَعَةِ، إِنَّمَا الشَّدِيدُ الَّذِي يَمْلِكُ نَفْسَهُ عِنْدَ الْغَضَبِ " .
also referenced under: Book 78, Hadith 141 (In-Book) & Volume 8, Book 73, Hadith 135 (USC-MSA)