I attended the 'Id (prayer) along with 'Umar. He offered prayer before the sermon. He then said: The Messenger of Allah (ﷺ) prohibited fasting on these two days. As regards Id al-Adha, you eat the meat of your sacrificial animals. As for 'Id al-Fitr, you break (i.e. end) your fast.
Reference: Sunan Abi Dawud 2416 In-book : Book 14, Hadith 104 English translation : Book 13, Hadith 2410
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