Sahih al-Bukhari 3102
صحيح البخاري#3102SahihNarrated `Abdullah bin `Umar:Once I went upstairs in Hafsa's house and saw the Prophet (ﷺ) answering the call of nature with his back towards the Qibla and facing Sham
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: 57:11