It is narrated from Sayyidah Umm Salamah (may Allah be pleased with her); she said: A woman came to the Messenger of Allah (peace and blessings be upon him) and said: "O Messenger of Allah, my daughter's husband has died, and she has a complaint in her eyes; shall I apply kohl to her eyes?" He (peace and blessings be upon him) said: "No." She asked this two or three times, and each time he (peace and blessings be upon him) kept saying: "No." Then he said: "It is only a period of four months and ten days, whereas previously one of you would throw a piece of dung at the end of a whole year."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20114