"One of you used to mourn for a year, then throw a piece of dung when a year had passed. Rather it (the mourning period) is four months and ten days."
Sunan an-Nasa'i Book 27, Hadith 153
← Previous Hadith "A woman from the Quraish came and said: 'O Messenger of Allah, my daughter's eyes are inflamed; shall I apply kohl to her?' (The daughter's) husband had died so (the Prophet) said: 'Not until four months and ten days (have passed).' Then she said: 'I fear for her sight.' He said: 'No, not until four months and ten days (have passed). During the Jahiliyyah one of you would mourn for her husband for a year, then when one year had passed she would throw a piece of dung.'"

Sunan an-Nasa'i Book 27, Hadith 152 Next Hadith → "My daughter's husband has died, and I am worried about her eyes; she needs kohl." He said: "One of you used to throw a piece of dung after a year had passed. Rather it (the mourning period) is four months and ten days." I (the narrator) said to Zainab: "What does 'after a year had passed' mean?" She said: "During the Jahiliyyah, if a woman's husband died she would go to the worst room she had and stay there, then, when a year had passed, she would come out and throw a piece of dung behind her."

Sunan an-Nasa'i Book 27, Hadith 154