Musnad Ahmad 1156:79

Abu al-Nadr Hashim ibn al-Qasim narrated to us, Abd al-Hamid—meaning ibn Bahram—narrated to us, he said: Shahr ibn Hawshab narrated to me, he said: I heard Umm Salamah, the wife of the Prophet, may Allah bless him and grant him peace, when the news of the death of al-Husayn ibn Ali came, she cursed the people of Iraq and said: "They killed him, may Allah kill them. They deceived him and humiliated him, may Allah curse them. For I saw the Messenger of Allah, may Allah bless him and grant him peace, when Fatimah came to him in the morning with a stone pot in which she had prepared *asidah* (a porridge-like dish) for him, carrying it on a tray of hers, until she placed it before him. He said to her: "Where is your cousin?" She said: "He is in the house." He said: "Go and call him, and bring me his two sons." She said: So she came leading her two sons, each one of them by a hand, and Ali was walking behind them, until they entered upon the Messenger of Allah, may Allah bless him and grant him peace. He seated them on his lap, and Ali sat on his right, and Fatimah sat on his left. Umm Salamah said: He pulled from beneath me a Khaybari cloak that was a rug for us on the bed in Medina. The Prophet, may Allah bless him and grant him peace, wrapped it around them all. Then he took the two ends of the cloak with his left hand, and raised his right hand to his Lord, the Mighty and Majestic, and said: "O Allah, my family; remove impurity from them and purify them with a thorough purification. O Allah, my family; remove impurity from them and purify them with a thorough purification. O Allah, my household; remove impurity from them and purify them with a thorough purification." I said: "O Messenger of Allah, am I not from your family?" He said: "Yes, so enter into the cloak." She said: So I entered into the cloak after he had finished his supplication for his cousin Ali, his two sons, and his daughter Fatimah, may Allah be pleased with them.