Sahih Bukhari Volume 7, Book 63, Hadith Number 254.

Narrated By Um ‘Atiyya : We were forbidden to mourn for more than three days for a dead person, except for a husband, for whom a wife should mourn for four months and ten days (while in the mourning period) we were not allowed to put kohl in our eyes, nor perfume our-selves, nor wear dyed clothes, except a garment of ‘Asb (special clothes made in Yemen). But it was permissible for us that when one of us became clean from her menses and took a bath, she could use a piece of a certain kind of incense. And it was forbidden for us to follow funeral processions.