Umm Salama told that a woman came to the Prophet (ﷺ) and said

" Messenger of Allah , my daughter’s husband has died and her eye is troubling her, so may we apply collyrium to it?” He said “No” twice or thrice, saying only “No” all the time. Then he said, “It is only four months and ten days, whereas in the pre-Islamic period none of you threw away the piece of dung till a year had passed.”* * The reference is to a pre-Islamic custom by which a widow threw a piece of dung when her idda period came to an end. Cf. Lane, Lexicon and Taj al-'arus; Mirqat, 3:513 f. (Bukhari and Muslim.)