It is narrated from Sayyiduna Jariyah bin Qudamah (may Allah be pleased with him) that a man said to the Prophet (peace and blessings be upon him): Tell me something, and keep it brief so that I can understand it. He (peace and blessings be upon him) said: "Do not become angry." The man repeated his request, and he (peace and blessings be upon him) again said: "Do not become angry."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 2082