"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 should mourn for him for four months and ten (days)."

أَنَّهَا سَمِعَتْ حَفْصَةَ بِنْتَ عُمَرَ زَوْجَ النَّبِيِّ ﷺ عَنِ النَّبِيِّ ﷺ قَالَ لاَ يَحِلُّ لاِمْرَأَةٍ تُؤْمِنُ بِاللَّهِ وَالْيَوْمِ الآخِرِ تَحِدُّ عَلَى مَيِّتٍ فَوْقَ ثَلاَثٍ إِلاَّ عَلَى زَوْجٍ فَإِنَّهَا تَحِدُّ عَلَيْهِ أَرْبَعَةَ أَشْهُرٍ وَعَشْرًا

"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 should mourn for him for four months and ten (days)."

عَنْ بَعْضِ أَزْوَاجِ النَّبِيِّ ﷺ وَعَنْ أُمِّ سَلَمَةَ أَنَّ النَّبِيَّ ﷺ قَالَ لاَ يَحِلُّ لاِمْرَأَةٍ تُؤْمِنُ بِاللَّهِ وَالْيَوْمِ الآخِرِ تَحِدُّ عَلَى مَيِّتٍ أَكْثَرَ مِنْ ثَلاَثَةِ أَيَّامٍ إِلاَّ عَلَى زَوْجٍ فَإِنَّهَا تَحِدُّ عَلَيْهِ أَرْبَعَةَ أَشْهُرٍ وَعَشْرًا

"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 should mourn for him for four months and ten (days)." (Using translation from Nasāʾī 3503)

عَنْ بَعْضِ أَزَاوِجِ النَّبِيِّ ﷺ قَالَتْ قَالَ رَسُولُ اللهِ ﷺ لَا يَحِلُّ لِامْرَأَةٍ تُؤْمِنُ بِاللهِ وَالْيَوْمِ الْآخِرِ أَوْ تُؤْمِنُ بِاللهِ وَرَسُولِهِ أَنْ تُحِدَّ عَلَى مَيِّتٍ فَوْقَ ثَلَاثٍ إِلَّا عَلَى زَوْجٍ فَإِنَّهَا تُحِدُّ عَلَيْهِ أَرْبَعَةَ أَشْهُرٍ وَعَشْرًا

[Machine] The Messenger of Allah ﷺ said: "It is not permissible for a Muslim woman who believes in Allah and the Last Day to mourn for a dead person for more than three days, except for a woman mourning her husband for four months and ten days." Shu'bah narrated to me, and Humeid ibn Nafi' narrated from Zaynab bint Abi Salamah, from her mother, and from a wife of the Prophet ﷺ similar to this. They reported this in the Sahih from the hadith of Shu'bah.

إِنَّ رَسُولَ اللهِ ﷺ قَالَ لَا يَحِلُّ لِامْرَأَةٍ مُسْلِمَةٍ تُؤْمِنُ بِاللهِ وَالْيَوْمِ الْآخِرِ أَنْ تُحِدَّ عَلَى مَيِّتٍ فَوْقَ ثَلَاثٍ إِلَّا الْمَرْأَةَ عَلَى زَوْجِهَا أَرْبَعَةَ أَشْهُرٍ وَعَشْرًا قَالَ شُعْبَةُ وَحَدَّثَنِي حُمَيْدُ بْنُ نَافِعٍ عَنْ زَيْنَبَ بِنْتِ أَبِي سَلَمَةَ عَنْ أُمِّهَا وَعَنِ امْرَأَةٍ مِنْ أَزْوَاجِ النَّبِيِّ ﷺ بِمِثْلِهِ أَخْرَجَاهُ فِي الصَّحِيحِ مِنْ حَدِيثِ شُعْبَةَ

The Prophet ﷺ said, "It is not lawful for a Muslim woman who believes in Allah and the Last Day to mourn for more than three days, except for her husband, for whom she should mourn for four months and ten days." (Using translation from Bukhārī 5339)

النَّبِيِّ ﷺ أَنَّهُ قَالَ لَا يَحِلُّ لِامْرَأَةٍ تُؤْمِنُ بِاللهِ وَالْيَوْمِ الْآخِرِ أَنْ تُحِدَّ عَلَى مَيِّتٍ فَوْقَ ثَلَاثَةِ أَيَّامٍ إِلَّا عَلَى زَوْجٍ فَإِنَّهَا تُحِدُّ عَلَيْهِ أَرْبَعَةَ أَشْهُرٍ وَعَشْرًا