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Fasting was observed on the day of 'Ashura' (i.e. 10th of Muharram) by the people of the Pre-lslamic Period. But when (the order of compulsory fasting) in the month of Ramadan was revealed, the Prophet (ﷺ) said, "It is up to one to fast on

He who wishes to observe this fast may do so, and he who wishes to abandon it may do so.

'Ashura is one of the days of Allah, so he who wished should observe fast and he who wished otherwise should abandon it.

'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.