Sayyidah Umm Salamah (may Allah be pleased with her) said: Sayyidah Fatimah came with some tharid of hers, which she was carrying on a platter, until she set it down before him, and he (peace and blessings be upon him) said to her: "And where is your cousin?" She said: He is in the house. He said: "Go and call him, and bring my two sons as well." So she came leading her two sons, each of them held by one hand, and Sayyiduna Ali was walking behind them, until they came in to the Messenger of Allah (peace and blessings be upon him). He (peace and blessings be upon him) seated the two of them in his lap, Sayyiduna Ali sat on his right, and Sayyidah Fatimah (may Allah be pleased with her) sat on his left. Sayyidah Umm Salamah (may Allah be pleased with her) said: I took from beneath me a cloak that was our bedding on the sleeping place in the house, and there was a pot in which there was khazirah (a dish of meat and flour). The Prophet (peace and blessings be upon him) said to her: "Call for me your husband and your two sons, Hasan and Husayn." So she called them, and they all sat together eating from that pot. She said: I was praying in that room, and this verse was revealed: "Allah only intends to remove all impurity from you, O people of the household, and to purify you thoroughly" [Surah al-Ahzab: 33]. Then he (peace and blessings be upon him) took the remaining part of the cloak and covered them with it, then he brought his right hand out of the cloak and raised it towards the sky, then said: "O Allah, these are my household and my close ones, so remove impurity from them and purify them thoroughly." Sayyidah Umm Salamah (may Allah be pleased with her) said: I put my head into the house and said: O Messenger of Allah, am I also with you? He (peace and blessings be upon him) said twice: "You are upon good."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 2653