Hadith No: 2
Al-Haythami - Majma' al-Zawa'id wa Manba' al-Fawa'id
Book of Manaqib - Chapter on the Virtue of Ahl al-Bayt (peace be upon them)
Volume: (9) - Page Number: (167)
14973 - Also narrated from Abu Ammar, who said: I was sitting with Wathilah ibn al-Asqah when they mentioned Ali and reviled him. When they stood up to leave, he said: "Sit, and I will tell you about what they insulted."
"I was with the Messenger of Allah (peace be upon him and his holy progeny) one day when Ali, Fatimah, Hasan, and Husayn (peace be upon them) came to him. He draped a cloak over them and then said: 'O Allah, these are the People of My House. Remove from them impurity and cleanse them with a thorough cleansing.'" I said: "O Messenger of Allah, and me?" He replied, "And you." He said: "By Allah, this is the most reassuring of my deeds within myself." In another narration, he said it is the most hopeful of what I hope for. Al-Tabarani narrated it with two chains, and the men in the narration are the men of authenticity, except for Kulthum ibn Ziyad, whom Ibn Hibban trusted, though he was considered weak.