The Messenger of Allah ﷺ said, “For fasting the Day of 'Ashūrā', I anticipate that Allah will expiate the previous year’s sins.”
[Muslim]
Ibn ‘Abbās (may Allah be well pleased with him) also narrates, “When the Messenger of Allah ﷺ fasted the Day of 'Ashūrā', and called for others to fast that day, someone said, ‘O Messenger of Allah, this is a day revered by the Jews and Christians.’ He replied, ‘In the next year, in shā’ Allah, we will also fast on the ninth day.’”
[Muslim]
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