Narrated Zainab bint Abi Salama :

I went to Um Habiba, the wife of Prophet, who said, "I heard the Prophets saying, 'It is not legal for a woman who believes in Allah and the Last Day to mourn for any dead person for more than three days except for her husband, (for whom she should mourn) for four months and ten days'." Later I went to Zainab bint Jahsh when her brother died;
she asked for some scent, and after using it she said, "I am not in need of scent but I heard Allah's Apostle saying, 'It is not legal for a woman who believes in Allah and the Last Day to mourn for more than three days for any dead person except her husband, (for whom she should mourn) for four months and ten days.' "

حَدَّثَنَا إِسْمَاعِيلُ، حَدَّثَنِي مَالِكٌ، عَنْ عَبْدِ اللَّهِ بْنِ أَبِي بَكْرِ بْنِ مُحَمَّدِ بْنِ عَمْرِو بْنِ حَزْمٍ، عَنْ حُمَيْدِ بْنِ نَافِعٍ، عَنْ زَيْنَبَ بِنْتِ أَبِي سَلَمَةَ، أَخْبَرَتْهُ قَالَتْ، دَخَلْتُ عَلَى أُمِّ حَبِيبَةَ زَوْجِ النَّبِيِّ ﷺ فَقَالَتْ سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ " لاَ يَحِلُّ لاِمْرَأَةٍ تُؤْمِنُ بِاللَّهِ وَالْيَوْمِ الآخِرِ تُحِدُّ عَلَى مَيِّتٍ فَوْقَ ثَلاَثٍ، إِلاَّ عَلَى زَوْجٍ أَرْبَعَةَ أَشْهُرٍ وَعَشْرًا ". ثُمَّ دَخَلْتُ عَلَى زَيْنَبَ بِنْتِ جَحْشٍ حِينَ تُوُفِّيَ أَخُوهَا، فَدَعَتْ بِطِيبٍ فَمَسَّتْ ثُمَّ قَالَتْ مَا لِي بِالطِّيبِ مِنْ حَاجَةٍ، غَيْرَ أَنِّي سَمِعْتُ رَسُولَ اللَّهِ ﷺ عَلَى الْمِنْبَرِ يَقُولُ " لاَ يَحِلُّ لاِمْرَأَةٍ تُؤْمِنُ بِاللَّهِ وَالْيَوْمِ الآخِرِ تُحِدُّ عَلَى مَيِّتٍ فَوْقَ ثَلاَثٍ، إِلاَّ عَلَى زَوْجٍ أَرْبَعَةَ أَشْهُرٍ وَعَشْرًا ".