Sahih Muslim | Book 9 | Hadith Number 3547

Narrated by Safiyya bint Abu 'Ubaid
Safiyya bint Abu 'Ubaid reported that she heard Hafsa daughter of Umar (Allah be pleased with them), (and) wife of Allah's Prophet (may peace be upon him), narrating a hadith like this from Allah's Apostle (may peace be upon him), and she made this addition: "She should abstain from adorning herself (in case of the death of her husband) for four months and ten days.