It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Teach people knowledge, make things easy, do not create difficulties," and he said three times, "When any of you becomes angry, he should remain silent."
Hadith Referenceمسند احمد / ومن مسند بني هاشم / 3448
Hadith Gradingحکم دارالسلام:حسن لغيره، وهذا إسناد ضعيف لضعف ليث