It wasnarrated that Abu 'Ubaid said:
"I was present for 'Eid with'Umar bin Khattab. He started with the prayer before the sermon,andsaid: 'The Messenger of Allah (ﷺ) forbade fasting on thesetwo days,the Day of Fitr and the Day of Adha. As for the Day ofFitr, it is theday when you break your fast, and on the Day of Adhayou eat the meatof your sacrifices.'"
English reference: Vol. 1, Book 7, Hadith 1722
Arabic reference: Book 7, Hadith 1793