Musannaf Ibn Abi Shaybah 5307 — Whether the sermon is long or short

Abu Rashid said: Sayyiduna Ammar (may Allah be pleased with him) addressed us and gave a brief khutbah. A man said to him: You were speaking very effectively; it would have been good if you had made it longer! He said: The Prophet (peace and blessings be upon him) forbade making the khutbah long.