Volume 2 · Book 15 · Hadith 104
Narrated Ibn 'Abbas: The Prophet went out and offered a two Rakat prayer on the Day of 'Id ul Fitr and did not offer any other prayer before or after it and at that time Bilal was accompanying him.
— Sahih Bukhari, Volume 2, Book 15: The Two Festivals (Eids), Hadith #104