Hisham bin 'Urwa هشام بن عروة · The Book of Divorce

"The Messenger of Allah gave us the choice and we chose him, and that was not counted as anything."

"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)."

"From her mother?" He said: "Yes" - "that the Prophet was asked about a woman whose husband had died but they were worried about her eyes - could she use kohl?" He said: "One of you used to stay in her house wearing her shabbiest clothes for a year, then she would come out. No, (the mourning period is) four months and ten (days)."

"The Messenger of Allah said: 'No woman should mourn for anyone who dies for more than three days, except for a husband, for whom she should mourn for four months and ten days. She should not wear garments that are dyed or patterned, or put on kohl or comb her hair, and she should not put on any perfume except when purifying herself after her period, when she may use a little of Qust or Azfar.'"

"One of you used to mourn for a year, then throw a piece of dung when a year had passed. Rather it (the mourning period) is four months and ten days."