Al-Bukhari and Muslim recorded that `A'ishah said, "(The day of) `Ashura' was a day of fasting. When the obligation to fast Ramadan was revealed, those who wished fasted, and those who wished did not.'' Al-Bukhari recorded the same from Ibn `Umar and Ibn Mas`ud.
﴿ وَعَلَى ٱلَّذِينَ يُطِيقُونَهُ ۥ فِدۡيَةٌ۬ طَعَامُ مِسۡكِينٍ۬ۖ ﴾
(...those who can fast with difficulty, (e.g., an old man), they have (a choice either to fast or) to feed a Miskin (poor person) (for every day).)
Mu`adh commented, "In the beginning, those who wished, fasted and those who wished, did not fast and fed a poor person for each day.'' Al- Bukhari recorded Salamah bin Al-Akwa` saying that when the Ayah:
﴿ وَعَلَى ٱلَّذِينَ يُطِيقُونَهُ ۥ فِدۡيَةٌ۬ طَعَامُ مِسۡكِينٍ۬ۖ ﴾
(...those who can fast with difficulty, (e.g., an old man), they have (a choice either to fast or) to feed a Miskin (poor person) (for every day).) was revealed, those who did not wish to fast, used to pay the Fidyah (feeding a poor person for each day they did not fast) until the following Ayah (2:185) was revealed abrogating the previous Ayah. It was also reported from `Ubaydullah from Nafi` that Ibn `Umar said; "It was abrogated.'' As-Suddi reported that Murrah narrated that `Abdullah said about this Ayah:
﴿ وَعَلَى ٱلَّذِينَ يُطِيقُونَهُ ۥ فِدۡيَةٌ۬ طَعَامُ مِسۡكِينٍ۬ۖ ﴾
(those who can fast with difficulty, (e.g., an old man), they have (a choice either to fast or) to feed a Miskin (poor person) (for every day).) "It means `those who find it difficult (to fast).' Formerly, those who wished, fasted and those who wished, did not but fed a poor person instead.'' Allah then said:
﴿ فَمَن تَطَوَّعَ خَيۡرً۬ا ﴾
(But whoever does good of his own accord) meaning whoever fed an extra poor person,
﴿ فَهُوَ خَيۡرٌ۬ لَّهُ ۥۚ وَأَن تَصُومُواْ خَيۡرٌ۬ لَّڪُمۡۖ ﴾
(it is better for him. And that you fast is better for you) Later the Ayah:
﴿ فَمَن شَہِدَ مِنكُمُ ٱلشَّہۡرَ فَلۡيَصُمۡهُۖ ﴾
(So whoever of you sights (the crescent on the first night of) the month (of Ramadan, i.e., is present at his home), he must observe Sawm (fasting) that month) (2:185) was revealed and this abrogated the previous Ayah (2:184).