Ashurah was a day on which we used to fast in pre-Islamic days. When (fasting of) Ramadan was prescribed, the Messenger of Allah (ﷺ) said: This is one of the days of Allah ; he who wishes may fast on it.
Reference: Sunan Abi Dawud 2443 In-book : Book 14, Hadith 131 English translation : Book 13, Hadith 2437
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