Weak
graded by Salim al-Hilali
Muwatta Malik 1270
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, said to a woman in mourning for her husband whose eyes were troubling her and the pain had become very strong, "Apply jala kohl at night and wipe it off in the day."
Reported by Malik (No. 1270).