It is narrated from Abu Rashid (may Allah have mercy on him) that Sayyiduna Ammar (may Allah be pleased with him) spoke and was very brief. It was said to him: "You have said something excellent; if only you had made it somewhat longer for us." He replied: "Indeed, the Messenger of Allah (peace and blessings be upon him) commanded us to keep sermons short."
Hadith Referenceمسند أبي يعلى الموصلي / مسند عمار بن ياسر / 1618
Hadith Takhrij«قال سعيد بن محمد السناري: صحيح» «أخرجه أبو داود [1106]، وأحمد [4/ 320]، والحاكم [1/ 426]، والبزار [1430]، وابن أبى شيبة [5201]، والبيهقي في "سننه" [رقم 5556]، وابن عبد البر في "التمهيد" [10/ 19]، و غيرهم، مسند ابویعلیٰ ترقیم الاثری: 1615»