Aishah said: The Quraish used to fast on the day of Ashurah in pre Islamic days. The Messenger of Allah صلی اللہ علیہ وسلم would fast on it in pre-Islamic period. When the Messenger of Allah صلی اللہ علیہ وسلم came to Madina, he fasted on it and commanded to fast on it. When the fast of Ramadan was prescribed, that became obligatory, and (fasting on) Ashurah was abandoned. He who wishes may fast on it and he who wishes may leave it.