Sahih al-Bukhari 926
صحيح البخاري#926SahihNarrated Al-Miswar bin Makhrama:Once Allah's Messenger (ﷺ) got up for delivering the Khutba and I heard him after "Tashah-hud" saying "Amma ba'du
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: 11:50