(6) باب الْوِتْرِ فِي السَّفَرِ
Narrated Ibn `Umar:
The Prophet (ﷺ) used to offer (Nawafil) prayers on his Rahila (mount) facing its direction by signals, but not the compulsory prayer. He also used to pray witr on his (mount) Rahila.
Reference: Sahih al-Bukhari 1000
In-book reference: Book 14, Hadith 11
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 2, Book 16, Hadith 114