HADITH ABOUT EID FESTIVAL

Narrated Uqbah ibn Amir (RA): The Prophet (peace be upon him) said: The day of Arafah, the day of sacrifice, the days of tashriq are (the days of) our festival, O people of Islam. These are the days of eating and drinking. 

(Sunan Abi Dawud, Book 14, Hadith 107)