It is narrated from Sayyidah Umm Salamah (may Allah be pleased with her) that Sayyidah Fatimah (may Allah be pleased with her) came with some food of hers to her father (peace and blessings be upon him) while he (peace and blessings be upon him) was on his bed. He (peace and blessings be upon him) said: "Go and call my sons and your cousin." She said: Then he covered them (all) with a cloak, or she said: I drew the cloak over them. Then he (peace and blessings be upon him) said: "O Allah, these are the people of my household (Ahl al-Bayt) and my closest ones, so remove impurity from them and purify them thoroughly." Umm Salamah (may Allah be pleased with her) said: O Messenger of Allah, am I with them too? He (peace and blessings be upon him) said: "You are the wife of the Prophet (peace and blessings be upon him), and you are headed towards goodness," or (he said): "you are upon goodness."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 19916