Musnad Abu Ya'la al-Mawsili 209:143

Abu Khaythama narrated to us, Muhammad ibn Abd Allah al-Asadi narrated to us, Sufyan narrated to us, from Zubayd, from Shahr ibn Hawshab, from Umm Salama: That the Prophet (peace and blessings of Allah be upon him) covered Ali, Hasan, Husayn, and Fatima with a cloak, then said: "O Allah, these are the people of my house (Ahl al-Bayt) and my close kin. O Allah, remove impurity from them and purify them with a thorough purification." Umm Salama said: I said, "O Messenger of Allah, am I among them?" He said: "You are upon goodness."