Sayyiduna Jariyah bin Qudamah (may Allah be pleased with him) said: I said: O Messenger of Allah, tell me something that will benefit me, and keep it brief so that I can remember it. He (peace and blessings be upon him) said: "Do not become angry." I repeated this request several times, and each time he (peace and blessings be upon him) said: "Do not become angry."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 2081