Fasting is forbidden on specific days in Islam. These days are primarily the two Eid festivals and the three days of Tashriq.
Forbidden Days of Fasting
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Eid al-Fitr: The day of Eid al-Fitr, marking the end of Ramadan, is a day of celebration and feasting, making fasting strictly prohibited. This is universally agreed upon by Islamic scholars.
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Eid al-Adha and the Three Days of Tashriq: Eid al-Adha and the three days following it (known as the Days of Tashriq) are also prohibited for fasting. The Prophet Muhammad (peace be upon him) explicitly stated, "You are not to fast these days. They are days of eating and drinking and remembering Allah." (Reported by Abu Hurairah).
The prohibition extends to both obligatory and voluntary fasts during these days.
Key References Supporting the Prohibition
Multiple reputable Islamic sources confirm this prohibition:
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IslamOnline: https://islamonline.net/en/days-forbidden-to-fast/ explicitly states that fasting on Eid days is prohibited.
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Wikipedia: https://en.wikipedia.org/wiki/Fasting_in_Islam mentions the prohibition on Eid al-Adha and the three days of Tashriq.
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Islam Question & Answer: https://islamqa.info/en/answers/42106/fasting-the-days-of-tashriq clarifies the prohibition on fasting during the days of Tashriq.
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Dr. Zakir Naik: https://www.facebook.com/photo.php?fbid=320406291455557&id=181836051979249&set=a.181904555305732 (Facebook post) lists fasting on the Eids among prohibited fasts.