Sahih Muslim Book 006, Hadith Number 2522.

Chapter : Fasting on the day of 'Ashura (1Oth of Muharram).

Abu Musa (Allah be pleased with him) reported: The day of 'Ashura was one which the Jews respected and they treated it as Id. The Messenger of Allah (may peace be upon him) said: You also observe fast on this day.

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