Safiyya bint Abu 'Ubaid narrated this tradition of Allah's Prophet (ﷺ) on the authority of some wives of Allah's Apostle (ﷺ)
Sahih Muslim Book 18, Hadith 83
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Sahih Muslim Book 18, Hadith 82 Next Hadith → 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.

Sahih Muslim Book 18, Hadith 84