مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2543
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that Ibn 'Abbas (رضي الله عنه) said:The Messenger of Allah (ﷺ) said: "Teach and make things easy, do not make things difficult. And if you get angry, keep quiet; if you get angry, keep quiet; if you get angry, keep quiet."
Musnad Ahmad 2556Hasan because of corroborating evidence; this is a da'eef is