Language:
كتاب الطلاق
68  
Divorce
(47)
Chapter: Can a mourning lady use kohl?
(47)
باب الْكُحْلِ لِلْحَادَّةِ
Sahih al-Bukhari 5338

Narrated Um Salama:

A woman was bereaved of her husband and her relatives worried about her eyes (which were diseased). They came to Allah's Messenger (ﷺ), and asked him to allow them to treat her eyes with kohl, but he said, "She should not apply kohl to her eyes. (In the Pre-Islamic period of Ignorance) a widowed woman among you would stay in the worst of her clothes (or the worst part of her house) and when a year had elapsed, if a dog passed by her, she would throw a globe of dung, Nay, (she cannot use kohl) till four months and ten days have elapsed."

حَدَّثَنَا آدَمُ بْنُ أَبِي إِيَاسٍ، حَدَّثَنَا شُعْبَةُ، حَدَّثَنَا حُمَيْدُ بْنُ نَافِعٍ، عَنْ زَيْنَبَ ابْنَةِ أُمِّ سَلَمَةَ، عَنْ أُمِّهَا، أَنَّ امْرَأَةً، تُوُفِّيَ زَوْجُهَا فَخَشُوا عَلَى عَيْنَيْهَا فَأَتَوْا رَسُولَ اللَّهِ صلى الله عليه وسلم فَاسْتَأْذَنُوهُ فِي الْكُحْلِ فَقَالَ ‏ "‏ لاَ تَكَحَّلْ قَدْ كَانَتْ إِحْدَاكُنَّ تَمْكُثُ فِي شَرِّ أَحْلاَسِهَا أَوْ شَرِّ بَيْتِهَا، فَإِذَا كَانَ حَوْلٌ فَمَرَّ كَلْبٌ رَمَتْ بِبَعَرَةٍ، فَلاَ حَتَّى تَمْضِيَ أَرْبَعَةُ أَشْهُرٍ وَعَشْرٌ ‏"‏‏.‏
Reference : Sahih al-Bukhari 5338
In-book reference : Book 68, Hadith 83
USC-MSA web (English) reference : Vol. 7, Book 63, Hadith 252
  (deprecated numbering scheme)