Al-Adab Al-Mufrad, Book 12, Hadith 8 (In-Book) ⓘ
Ibn 'Abbas reported that the Messenger of Allah, 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."
حَدَّثَنَا مُحَمَّدُ بْنُ سَلامٍ، قَالَ: أَخْبَرَنَا مُحَمَّدُ بْنُ فُضَيْلِ بْنِ غَزْوَانَ، عَنْ لَيْثٍ، عَنْ طَاوُسٍ، عَنِ ابْنِ عَبَّاسٍ قَالَ: قَالَ رَسُولُ اللهِ صلى الله عليه وسلم: عَلِّمُوا وَيَسِّرُوا وَلاَ تُعَسِّرُوا، وَإِذَا غَضِبَ أَحَدُكُمْ فَلْيَسْكُتْ.
also referenced under: Hadith 245 (Reference) & Book 12, Hadith 245 (English)