Zainab bint Abi Salamah narrated that her mother Umm Salamah said: “A woman from the Quraish came and said: ‘Messenger of Allah صلی اللہ علیہ وآلہ وسلم, my daughter’s eyes are inflamed; shall I apply kohl to her?’ (The daughter’s) husband had died so (the Prophet صلی اللہ علیہ وآلہ وسلم ) 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.” (Sahih).