"I entered upon Umm Habibah, the wife of the Prophet, when her father Abu Sufyan bin Harb died. Umm Habibah called for some perfume and put some on a young girl, then she put some on her cheeks. Then she said: 'By Allah, I do not have any need for perfume but I heard the Messenger of Allah say: 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.'"
Sunan an-Nasa'i Book 27, Hadith 145
← Previous Hadith "My husband died in Al-Qadum, so I went to the Prophet and told him that our house was remote." He gave her permission then he called her back and said: "Stay in your house for four months and ten days, until the term prescribed is fulfilled."

Sunan an-Nasa'i Book 27, Hadith 144 Next Hadith → "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.'"

Sunan an-Nasa'i Book 27, Hadith 146