"Then I went into Zainab bint Jahsh when her brother died, and she called for some perfume and put some on. Then she said: 'By Allah, I do not have any need for perfume but I heard the Messenger of Allah say on the Minbar: It is not permissible for any woman who believes in Allah and the Last Day to mourn for anyone who dies for more than three days, except for a husband, (for whom the mourning period is) four months and ten days.'"
Reference: Sunan an-Nasa'i 3533b In-book : Book 27, Hadith 146 English translation : Vol. 4, Book 27, Hadith 3563
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