Zaynab bint Abi Salamah narrates that when Umm Habibah (may Allah be pleased with her) received the news of the death of her father Abu Sufyan, she called for perfume and applied it to her arms, and said: By Allah! I would have no need of perfume had I not 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 / 19725