Sahih
Muslim
صحيح مسلم
18
The Book of Divorce
كتاب الطلاق
Chapter 9: The Obligation to mourn during the 'Iddah following the death of one's husband, but it is forbidden to mourn for more than three days in other cases
باب وُجُوبِ الإِحْدَادِ فِي عِدَّةِ الْوَفَاةِ وَتَحْرِيمِهِ فِي غَيْرِ ذَلِكَ إِلاَّ ثَلاَثَةَ أَيَّامٍ
Sahih Muslim 1487, 1488 b
This hadith was narrated by Zainab from her mother and from Zainab, the wife of Allah's Messenger (ﷺ), or from some other lady from among the wives of the Prophet (ﷺ).
وَحَدَّثَتْهُ زَيْنَبُ، عَنْ أُمِّهَا، وَعَنْ زَيْنَبَ، زَوْجِ النَّبِيِّ صلى الله عليه وسلم أَوْ عَنِ امْرَأَةٍ مِنْ بَعْضِ أَزْوَاجِ النَّبِيِّ صلى الله عليه وسلم .
Grade: Sahih