It is narrated from Sayyidah Zaynab bint Abi Salamah (may Allah be pleased with her) that she heard Sayyidah Umm Habibah and Sayyidah Umm Salamah (may Allah be pleased with them both) relating that a woman came to the Prophet (peace and blessings be upon him) and told him that a daughter of hers had lost her husband, and she had a complaint in her eyes, and she wanted to apply kohl to her eyes. So the Messenger of Allah (peace and blessings be upon him) said: "Previously one of you would throw a piece of dung at the end of the year, whereas this is only a waiting period of four months and ten days."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20119