Sunan an-Nasa'i #490 · The Book of Salah

Sunan an-Nasa'iIt was narrated from Salim that his father said
Sunan an-Nasa'i · Book 5 · The Book of Salah
Sunan an-Nasa'i · كتاب 5 · كتاب الصلاة
"The Messenger of Allah (ﷺ) used to pray voluntary prayers (Usabbih) while riding his mount, facing whatever direction it was facing, and he would pray Witr likewise, but he would not offer the prescribed prayers on it
أَخْبَرَنَا عِيسَى بْنُ حَمَّادٍ، زُغْبَةُ وَأَحْمَدُ بْنُ عَمْرِو بْنِ السَّرْحِ وَالْحَارِثُ بْنُ مِسْكِينٍ قِرَاءَةً عَلَيْهِ وَأَنَا أَسْمَعُ، - وَاللَّفْظُ لَهُ - عَنِ ابْنِ وَهْبٍ، عَنْ يُونُسَ، عَنِ ابْنِ شِهَابٍ، عَنْ سَالِمٍ، عَنْ أَبِيهِ، قَالَ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يُسَبِّحُ عَلَى الرَّاحِلَةِ قِبَلَ أَىِّ وَجْهٍ تَتَوَجَّهُ وَيُوتِرُ عَلَيْهَا غَيْرَ أَنَّهُ لاَ يُصَلِّي عَلَيْهَا الْمَكْتُوبَةَ ‏.‏
Reference : Sunan an-Nasa'i 490In-book reference : Book 5, Hadith 43