Ibn 'Abbas said, "The Messenger of Allah, may Allah bless him and grant him peace, said, ' Teach and make it easy. Teach and make it easy.' three times. He went on, 'When you are angry, be silent' twice."  

قَالَ رَسُولُ اللهِ ﷺ عَلِّمُوا وَيَسِّرُوا عَلِّمُوا وَيَسِّرُوا ثَلاَثَ مَرَّاتٍ وَإِذَا غَضِبْتَ فَاسْكُتْ مَرَّتَيْنِ