Narrated 'Aisha: The people used to fast on the day of 'Ashura' before fasting in Ramadan was prescribed but when (the order of compulsory fasting in) Ramadan was revealed, it was up to one to fast on it (i.e. 'Ashura') or not.
— Sahih Bukhari, Volume 6, Book 60: Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh)), Hadith #29
Narrated 'Aisha: The people used to fast on the day of 'Ashura' before fasting in Ramadan was prescribed but when (the order of compulsory fasting in) Ramadan was revealed, it was up to one to fast on it (i.e. 'Ashura') or not.
This hadith is from the book of Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh)) in Sahih Bukhari, compiled by Imam al-Bukhari. It is hadith number 29 in book 60 of volume 6.
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