وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ أُمَّ سَلَمَةَ، زَوْجَ النَّبِيِّ صلى الله عليه وسلم قَالَتْ لاِمْرَأَةٍ حَادٍّ عَلَى زَوْجِهَا اشْتَكَتْ عَيْنَيْهَا فَبَلَغَ ذَلِكَ مِنْهَا اكْتَحِلِي بِكُحْلِ الْجِلاَءِ بِاللَّيْلِ وَامْسَحِيهِ بِالنَّهَارِ ‏.‏

Yahya related to me from Malik that he had heard that Umm Salama,the wife of the Prophet, may Allah bless him and grant him peace, saidto a woman in mourning for her husband whose eyes were troubling herand the pain had become very strong, "Apply jala kohl at night andwipe it off in the day." Translation Not Available

Book Ref: Muwatta Imam Malik Book 29 Hadith 1270
Web Ref:  Muwatta Imam Malik Book 29 Hadith 105