The prohibition of fasting the days of At-Tashriq, which are the days of eating, drinking and remembering Allah, The Mighty and Sublime Sahih Muslim 1141 b

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Translation
Nabaisha reported that Khalid said

I met Abu Malih and asked him and he narrated it to me from the Messenger of Allah (ﷺ). a hadith like one (narrated above) with this addition:" And remembrance of Allah"