Sahih al-Bukhari 68:90
Narrated Zainab bint Um Salama:
When Um Habiba bint Abi Sufyan was informed of her father's death, she asked for perfume and rubbed it over her arms and said, "I am not in need of perfume, but I have heard the Prophet (ﷺ) saying, "It is not lawful for a lady who believes in Allah and the Last Day to mourn for more than three days except for her husband for whom the (mourning) period is four months and ten days."
Reference
Sahih al-Bukhari 68:90
In-book reference
Book 68, Hadith 90
Arabic Text
حَدَّثَنَا مُحَمَّدُ بْنُ كَثِيرٍ، عَنْ سُفْيَانَ، عَنْ عَبْدِ اللَّهِ بْنِ أَبِي بَكْرِ بْنِ عَمْرِو بْنِ حَزْمٍ، حَدَّثَنِي حُمَيْدُ بْنُ نَافِعٍ، عَنْ زَيْنَبَ ابْنَةِ أُمِّ سَلَمَةَ، عَنْ أُمِّ حَبِيبَةَ ابْنَةِ أَبِي سُفْيَانَ، لَمَّا جَاءَهَا نَعِيُّ أَبِيهَا دَعَتْ بِطِيبٍ، فَمَسَحَتْ ذِرَاعَيْهَا وَقَالَتْ مَا لِي بِالطِّيبِ مِنْ حَاجَةٍ. لَوْلاَ أَنِّي سَمِعْتُ النَّبِيَّ صلى الله عليه وسلم يَقُولُ " لاَ يَحِلُّ لاِمْرَأَةٍ تُؤْمِنُ بِاللَّهِ وَالْيَوْمِ الآخِرِ تُحِدُّ عَلَى مَيِّتٍ فَوْقَ ثَلاَثٍ، إِلاَّ عَلَى زَوْجٍ أَرْبَعَةَ أَشْهُرٍ وَعَشْرًا ".