Umm Salama bint Abu Umaya reported,

The Prophet ﷺ was in her house when Fatimah came to him with a pot containing khazirah. She entered with it, and he said to her, "Call your husband and your two sons."She said, Ali, Hasan, and Husayn came and entered upon him, and they sat eating from that khazirah. He was resting on a couch upon a bench, beneath him a Khaybar cloak.She said, I was praying in the chamber when Allah revealed this verse, "Allah only wishes to remove all impurity from you, people of the household, and to purify you completely" [Ahzab 33:33].She said, He took the remaining part of the cloak and covered them with it. Then he stretched out his hand, raising it toward the sky, and said, "O Allah, these are the people of my household and my closest ones, so remove from them all impurity and purify them completely. O Allah, these are the people of my household and my closest ones, so remove from them all impurity and purify them completely."She said, I put my head into the room and said, "Am I with you too, Messenger of Allah?"He replied, "You are upon goodness, you are upon goodness."

عن أم سلمة

أن النبي ﷺ كان في بيتها، فأتته فاطمة ببرمة فيها خزيرة، فدخلت بها عليه فقال لها: ادعي زوجك وابنيك. قالت: فجاء علي والحسين والحسن، فدخلوا عليه، فجلسوا يأكلون من تلك الخزيرة، وهو على منامة له على دكان تحته كساء خيبري. قالت: وأنا أصلي في الحجرة، فأنزل الله عز وجل هذه الآية: {إنما يريد الله ليذهب عنكم الرجس أهل البيت ويطهركم تطهيرا} قالت: فأخذ فضل الكساء فغشاهم به، ثم أخرج يده، فألوى بها إلى السماء، ثم قال: اللهم هؤلاء أهل بيتي وخاصتي، فأذهب عنهم الرجس، وطهرهم تطهيرا، اللهم هؤلاء أهل بيتي وخاصتي، فأذهب عنهم الرجس وطهرهم تطهيرا. قالت: فأدخلت رأسي البيت، فقلت: وأنا معكم يا رسول الله قال: إنك إلي خير، إنك إلي خير.