Sahih al-Bukhari 498
صحيح البخاري#498SahihNarrated `Abdullah:The Prophet (ﷺ) used to get a Harba planted in front of him (as a Sutra) and pray behind it
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: 8:145