Sahih al-Bukhari

لَيْسَ الشَّدِيدُ بِالصُّرَعَةِ، إِنَّمَا الشَّدِيدُ الَّذِي يَمْلِكُ نَفْسَهُ عِنْدَ الْغَضَبِ

“The strong person is not the one who overcomes others by force. The strong person is the one who controls themselves when angry.”

— Sahih al-Bukhari, Bukhari 6114