Abu Yahya said: I was between Sayyiduna al-Hasan and Sayyiduna al-Husayn (may Allah be pleased with them both) and Marwan, and they were reviling one another. Sayyiduna al-Hasan was trying to quieten Sayyiduna al-Husayn, when Marwan said: An accursed household! Sayyiduna al-Hasan became angry and said: "You said an accursed household? By Allah! Allah cursed you on the tongue of His Prophet (peace and blessings be upon him) while you were still in the loins of your father."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 2727