It is narrated from Hazrat Anas (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) continuously, for six months, when passing near the house of Hazrat Fatimah (may Allah be pleased with her) at the time of Fajr prayer, used to say: O people of the household! Wake up for prayer. O people of the household! Allah wishes to remove impurity from you and to purify you thoroughly.