Divorce
Ṣaḥīḥ al-Bukhārī 5338
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
lā takaḥḥal qad kānat iḥdākunna tamkuthu fī sharri aḥlāsihā aw sharri baytihā, fa-idhā kāna ḥawlun famarra kalbun ramat bibaʿaratin, falā ḥattā tamḍiya arbaʿah ashhurin waʿashrun
Transliteration generated from the Arabic vowel marks
The full narration
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
Source
Ṣaḥīḥ al-Bukhārī · 5338