Sahih al-Bukhari 1079
صحيح البخاري#1079SahihNarrated Ibn `Umar.:Whenever the Prophet (ﷺ) recited the Sura which contained the prostration of recitation he used to prostrate and then we too, would prostrate and some of us did not find a place for prostration
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: 17:13