It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that for six months the Messenger of Allah (peace and blessings be upon him) would pass by the house of Sayyidah Fatimah (may Allah be pleased with her) when he came out for the Fajr prayer, and would say: "O people of the household, the prayer!" "Allah only intends to remove all impurity from you, O people of the household, and to purify you thoroughly" [Surah al-Ahzab: 33].
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 2658