The Book of Fasting (Kitab Al-Sawm)

Muslim :: Book 6 : Hadith 2536

Abu Sa'id al-Khudri (Allah be pleased with him) reported that the Messenger of Allah (may peace be upon him) forbade to observe fast on two days the day of Fitr and the day of Sacrifice ('Id-ul-Adha).

Source materials are from the University of Southern California MSA site
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