Jami` at-Tirmidhi 1197

Humaid bin Nafi narrated that :Zainab said: "And I heard my mother, Umm Salamah said: 'A woman came to the Messenger of Allah and she said: "O Messenger of Allah! My daughter's husband died, and she is suffering from an eye ailment, so can she use Kohl?" the Messenger of Allah said: "No" two or three time. Each time (she asked) he said "no." Then he said: "It is just a mater of four months and ten (days). During Jahliyyah one of you would throw a clump of camel dung when one year passed