The Book of Fasting (Kitab Al-Sawm)

Muslim :: Book 6 : Hadith 2522

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.

Source materials are from the University of Southern California MSA site
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