Umm Salama bint Abu Umaya reported,

The Prophet ﷺ was at her house when Fatimah brought him a pot containing a porridge-like dish called 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, then sat eating from that khazirah. He was resting on a bedding placed on a bench, with a Khaybar cloak beneath him.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 then took the extra portion of the cloak and wrapped it around them. Then he stretched out his hand, raised it toward the heavens, and said, "O Allah, these are the people of my household and those closest to me. Remove from them all impurity and purify them completely. O Allah, these are the people of my household and those closest to me. Remove from them all impurity and purify them completely."She said, I put my head into the room and said, "And am I with you, 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.