Mu'jam Kabir Tabarani 2685 — Amr bin al-As and al-Mughirah bin Shu'bah

Abu Mijlaz (may Allah have mercy on him) (as the narrator recalled it) said: Amr bin al-As and al-Mughirah bin Shu'bah said to Mu'awiyah: Hasan bin Ali is slow of speech, although he has eloquence and judgement; we know his manner - he will start speaking and then find nothing more to say. Mu'awiyah said: Do not do it. But they both refused, so Amr ascended the pulpit, mentioned Sayyiduna Ali (may Allah be pleased with him) and disparaged him. Then al-Mughirah bin Shu'bah ascended, praised and extolled Allah, then disparaged Sayyiduna Ali (may Allah be pleased with him). Then Sayyiduna Hasan bin Ali (may Allah be pleased with him) was told: Ascend. He said: I will neither ascend nor speak until you give me your assurance that if I speak the truth you will confirm it, and if I speak falsehood you will declare me a liar. They agreed to this, so he ascended the pulpit, praised and extolled Allah, then said: By Allah, O Amr, and you, O Mughirah, do you know that the Messenger of Allah (peace and blessings be upon him) said: "May Allah curse the one driving and the one riding," and that one of them was so-and-so? They both said: By Allah, yes, certainly. He said: I adjure you by Allah, O Mu'awiyah and O Mughirah, do you know that the Messenger of Allah (peace and blessings be upon him) cursed Amr with a curse for every line of verse he composed? They both said: By Allah, yes. He said: I adjure you by Allah, O Amr, and you, O Mu'awiyah bin Abi Sufyan, do you know that the Messenger of Allah (peace and blessings be upon him) cursed this man's people? They both said: Yes. Sayyiduna Hasan (may Allah be pleased with him) said: Then I praise Allah that you have reviled a man who was free of all this. The narrator then mentioned the rest of the hadith.