Sahih al-Bukhari 1095
صحيح البخاري#1095SahihNarrated Nafi`:Ibn `Umar (while on a journey) used to offer the prayer and the witr on his mount (Rahila). He said that the Prophet (ﷺ) used to do so
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: 18:15