It was narrated that Zainab bint Umm Salamah said:
"Umm Habibah said: 'I heard the Messenger of Allah say: It is not permissible for a woman who believes in Allah and the Last Day to mourn for anyone who dies for more than three days, except for a husband; (she mourns for him for) four months and ten (days)."
Reference: Sunan an-Nasa'i 3500 In-book : Book 27, Hadith 112 English translation : Vol. 4, Book 27, Hadith 3530
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