حَدَّثَنَا مُحَمَّدُ بْنُ سَلامٍ، قَالَ: أَخْبَرَنَا مُحَمَّدُ بْنُ فُضَيْلِ بْنِ غَزْوَانَ، عَنْ لَيْثٍ، عَنْ طَاوُسٍ، عَنِ ابْنِ عَبَّاسٍ
قَالَ: قَالَ رَسُولُ اللهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «عَلِّمُوا وَيَسِّرُوا وَلَا تُعَسِّرُوا، وَإِذَا غَضِبَ أَحَدُكُمْ فَلْيَسْكُتْ»
The Messenger of Allah (sallallahu alayhi wa sallam), may Allah bless him and grant him peace, said, “Teach and make things easy and not difficult. When one of you is angry, he should be silent.”
Al-Adab Al-Mufrad 245, Book 12, Cheerfulness Towards People, Hadith 8. 1 min read