Yahya related to me from Malik from Muhammad ibn Yahya ibn Habbanfrom alAraj from Abu Hurayra that the Messenger of Allah, may Allahbless him and grant him peace, forbade fasting on two days, the day ofFitr and the day of Adha.
USC-MSA web (English) reference: Book 18, Hadith 36
Arabic reference: Book 18, Hadith 670