What did the Prophet Muhammad (saw) say about the length of time a woman who believes in Allah and the Last Day should mourn for a deceased person, other than her husband?
 Narrated Zainab bint Abi Salama:                     I went to Um Habiba, the wife of Prophet, who said, "I heard the Prophets saying, 'It is not legal for a woman who believes in Allah and the Last Day to mourn for any dead person for more than three days except for her husband, (for whom she should mourn) for four months and ten days'." Later I went to Zainab bint Jahsh when her brother died; she asked for some scent, and after using it she said, "I am not in need of scent but I heard Allah's Apostle saying, 'It is not legal for a woman who believes in Allah and the Last Day to mourn for more than three days for any dead person except her husband, (for whom she should mourn) for four months and ten days.' "