Abu Muhammad, come near and dine. Upon this he said: I am fasting. Thereupon he said: We used to observe fast and then (this practice) was abandoned.
Sahih Muslim Book 13, Hadith 156
← Previous Hadith When (fasting) in Ramadan was (made) obligatory, he abandoned it (the practice of observing fast on Ashura).

Sahih Muslim Book 13, Hadith 155 Next Hadith → Abu Abd al-Rahman, it is the day of 'Ashura (and you are eating). Upon this he said: Fast was observed on (this day) before the (fasting) in Ramadan was made obligatory, but when it was made obligatory, (fasting on the day of 'Ashura) was abandoned. So if you are not fasting, then take food.

Sahih Muslim Book 13, Hadith 157