Sahih al-Bukhari 747
صحيح البخاري#747SahihNarrated Al-Bara:(And Al-Bara was not a liar) Whenever we offered prayer with the Prophet (ﷺ) and he raised his head from the bowing, we used to remain standing till we saw him prostrating
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: 10:141