Sahih Muslim 3739
صحيح مسلم#3739SahihA'isha (Allah be pleased with her) reported Allah's Messenger (ﷺ) as saying:It is not permissible for a woman believing in Allah and the Hereafter to observe mourning on the dead for more than three (days), except in case of her husband
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 18:84