Sahih al-Bukhari 234
صحيح البخاري#234SahihNarrated Anas:Prior to the construction of the mosque, the Prophet (ﷺ) offered the prayers at sheep-folds
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: 4:100