Volume 2 · Book 15 · Hadith 77
Narrated 'Abdullah bin Umar: Allah's Apostle used to offer the prayer of 'Id-ul-Adha and 'Id-ul-Fitr and then deliver the Khutba after the prayer.
— Sahih Bukhari, Volume 2, Book 15: The Two Festivals (Eids), Hadith #77