Once, some people came to Sayyiduna Umar (may Allah be pleased with him) and said, "We have come to ask you three questions. What is the ruling on offering voluntary prayers at home? What is the method of performing ghusl after janabah? If a woman is in her 'days' (menstruation), to what extent is a man permitted (to have relations with her)?" Sayyiduna Umar (may Allah be pleased with him) replied, "You people seem very intelligent. Since the time I asked the Prophet (peace and blessings be upon him) about these matters, no one has asked me these questions until today, as you have. He said: When a person offers voluntary prayers at home, it is light, so whoever wishes may illuminate his house. Regarding the method of ghusl after janabah, he said: First wash the private parts, then perform wudu, then pour water over the head three times, and then bathe as usual. And regarding a woman in her 'days', he said: Whatever part is above the izar (waist-wrapper), a man may benefit from that."