Narrated: Bishr bin Suhaim
The Messenger of Allah (saw) delivered a sermon on the days of Tashriq (11th, 12th, and 13th of dhul-hijjah) and said: “No one will enter Paradise but a Muslim soul, and these days are the days of eating and drinking.”
Sunan Ibn Majah chapter 9, the book of fasting Hadith 1720.