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The tenth day of Muharram,it is recommended to fast the day before Ashoora and on da day of Ashura itself.
Abu Hurayrah (ra) said: “The Messenger of Allaah (saw) said: ‘The best of fasting after Ramadaan is fasting Allaah’s month of Muharram.’” (reported by Muslim, 1982).
The Prophet (saw)said: “For fasting the day of ‘Aashooraa’, I hope that Allaah will accept it as expiation for the year that went before.” (Reported by Muslim, 1976).
Also Imaam al-Nawawi (ra) said:
“It expiates for all minor sins, i.e., it brings forgiveness of all sins except major sins.”
It is recommended to fast two days to be different from the Jews,so muslims fast the day before Ashoora and the day of Ashoora itself.
Muslimdoc