Sahih al-Bukhari 4489
صحيح البخاري#4489SahihNarrated Anas:None remains of those who prayed facing both Qiblas (that is, Jerusalem and Mecca) except myself
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: 65:16