Zaynab bint Abi Salamah (may Allah be pleased with her) narrates that she went to Umm Habibah bint Abi Sufyan (may Allah be pleased with her), the wife of the Prophet (peace and blessings be upon him), when her father Abu Sufyan (may Allah be pleased with him) passed away. Umm Habibah (may Allah be pleased with her) called for a yellow perfume, or some other perfume, and applied it to a slave girl, then also applied it to her own two cheeks. Then she said: By Allah! I have no need of perfume, except that I heard the Messenger of Allah (peace and blessings be upon him) saying: "It is not lawful for a woman who believes in Allah and the Last Day to mourn for a deceased person for more than three nights, except for a husband, for whom she mourns four months and ten days."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 19724