Sahih al-Bukhari 957
صحيح البخاري#957SahihNarrated `Abdullah bin `Umar:Allah's Messenger (ﷺ) used to offer the prayer of `Id-ul-Adha and `Id-ul-Fitr and then deliver the Khutba after the prayer
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 13:9