Narrated 'Aisha: Allah's Apostle ordered (the Muslims) to fast on the day of 'Ashura', and when fasting in the month of Ramadan was prescribed, it became optional for one to fast on that day ('Ashura') or not.
— Sahih Bukhari, Volume 3, Book 31: Fasting, Hadith #219
Narrated 'Aisha: Allah's Apostle ordered (the Muslims) to fast on the day of 'Ashura', and when fasting in the month of Ramadan was prescribed, it became optional for one to fast on that day ('Ashura') or not.
This hadith is from the book of Fasting in Sahih Bukhari, compiled by Imam al-Bukhari. It is hadith number 219 in book 31 of volume 3.
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