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bukhari:1098 – al-Layth > Yūnus > Ibn Shihāb

At night ʿAbdullah bin ʿUmar used to offer the prayer on the back of his animal during the journey and never cared about the direction he faced. Ibn ʿUmar said, "Messenger of Allah ﷺ used to offer the optional prayer on the back of his Mount facing any direction and also used to pray the witr on it but never offered the compulsory prayer on it."  

البخاري:١٠٩٨ – وَقَالَ اللَّيْثُ حَدَّثَنِي يُونُسُ عَنِ ابْنِ شِهَابٍ قَالَ قَالَ

سَالِمٌ كَانَ عَبْدُ اللَّهِ يُصَلِّي عَلَى دَابَّتِهِ مِنَ اللَّيْلِ وَهْوَ مُسَافِرٌ مَا يُبَالِي حَيْثُ مَا كَانَ وَجْهُهُ قَالَ ابْنُ عُمَرَ وَكَانَ رَسُولُ اللَّهِ ﷺ يُسَبِّحُ عَلَى الرَّاحِلَةِ قِبَلَ أَىِّ وَجْهٍ تَوَجَّهَ وَيُوتِرُ عَلَيْهَا غَيْرَ أَنَّهُ لاَ يُصَلِّي عَلَيْهَا الْمَكْتُوبَةَ  

See similar narrations below:

Collected by Muslim, Nasāʾī, Ibn Ḥibbān, Nasāʾī's Kubrá
muslim:700i – Ḥarmalah b. Yaḥyá > Ibn Wahb > Yūnus > Ibn Shihāb > Sālim b. ʿAbdullāh from his father

Salim b. 'Abdullah reported on the authority of his father that the Messenger of Allah (may peace be. upon him) used to observe Nafl (supererogatory) prayer on his ride no matter in what direction it turned its face, and he observed Witr too on it, but did not observe obligatory prayer on it.  

مسلم:٧٠٠i – وَحَدَّثَنِي حَرْمَلَةُ بْنُ يَحْيَى أَخْبَرَنَا ابْنُ وَهْبٍ أَخْبَرَنِي يُونُسُ عَنِ ابْنِ شِهَابٍ عَنْ سَالِمِ بْنِ عَبْدِ اللَّهِ عَنْ أَبِيهِ قَالَ

كَانَ رَسُولُ اللَّهِ ﷺ يُسَبِّحُ عَلَى الرَّاحِلَةِ قِبَلَ أَىِّ وَجْهٍ تَوَجَّهَ وَيُوتِرُ عَلَيْهَا غَيْرَ أَنَّهُ لاَ يُصَلِّي عَلَيْهَا الْمَكْتُوبَةَ  

nasai:490 – ʿĪsá b. Ḥammād Zughbah And ʾAḥmad b. ʿAmr b. al-Sarḥ Wa-al-Ḥārith b. Miskīn > Ibn Wahb > Yūnus > Ibn Shihāb > Sālim from his father

"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."  

النسائي:٤٩٠ – 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 ﷺ يُسَبِّحُ عَلَى الرَّاحِلَةِ قِبَلَ أَىِّ وَجْهٍ تَتَوَجَّهُ وَيُوتِرُ عَلَيْهَا غَيْرَ أَنَّهُ لاَ يُصَلِّي عَلَيْهَا الْمَكْتُوبَةَ  

nasai:744 – ʿĪsá b. Ḥammād > Ibn Wahb > Yūnus > Ibn Shihāb > Sālim > ʿAbdullāh

"The messenger of Allah (peace be upon him) used to pray atop his mount while traveling, facing whatever direction it was facing, and he would pray witr atop it, but he did not pray the prescribed prayers atop it ".  

النسائي:٧٤٤ – أَخْبَرَنَا عِيسَى بْنُ حَمَّادٍ قَالَ حَدَّثَنَا ابْنُ وَهْبٍ قَالَ أَخْبَرَنِي يُونُسُ عَنِ ابْنِ شِهَابٍ عَنْ سَالِمٍ عَنْ عَبْدِ اللَّهِ قَالَ

كَانَ رَسُولُ اللَّهِ ﷺ يُصَلِّي عَلَى الرَّاحِلَةِ قِبَلَ أَىِّ وَجْهٍ تَوَجَّهُ بِهِ وَيُوتِرُ عَلَيْهَا غَيْرَ أَنَّهُ لاَ يُصَلِّي عَلَيْهَا الْمَكْتُوبَةَ  

ذِكْرُ الْخَبَرِ الْمُدْحِضِ قَوْلَ مَنْ زَعَمَ أَنَّ الْوِتْرَ لَا يُصَلَّى إِلَّا عَلَى الْأَرْضِ

ibnhibban:2421 – Muḥammad b. al-Ḥasan b. Qutaybah > Ḥarmalah b. Yaḥyá > Ibn Wahb > Yūnus > Ibn Shihāb > Sālim b. ʿAbdullāh from his father

Salim b. 'Abdullah reported on the authority of his father that the Messenger of Allah (may peace be. upon him) used to observe Nafl (supererogatory) prayer on his ride no matter in what direction it turned its face, and he observed Witr too on it, but did not observe obligatory prayer on it. (Using translation from Muslim 700i)  

ابن حبّان:٢٤٢١ – حَدَّثَنَا مُحَمَّدُ بْنُ الْحَسَنِ بْنِ قُتَيْبَةَ قَالَ حَدَّثَنَا حَرْمَلَةُ بْنُ يَحْيَى قَالَ حَدَّثَنَا ابْنُ وَهْبٍ قَالَ أَخْبَرَنَا يُونُسُ عَنِ ابْنِ شِهَابٍ عَنْ سَالِمِ بْنِ عَبْدِ اللَّهِ عَنْ أَبِيهِ قَالَ

«كَانَ رَسُولُ اللَّهِ ﷺ يُسَبِّحُ عَلَى رَاحِلَتِهِ قِبَلَ أَيِّ وَجْهٍ تَوَجَّهَ وَيُوتِرُ عَلَيْهَا غَيْرَ أَنَّهُ لَا يُصَلِّي عَلَيْهَا الْمَكْتُوبَةَ» قَالَ سَالِمٌ «وَكَانَ ابْنُ عُمَرَ يُصَلِّي عَلَى دَابَّتِهِ مِنَ اللَّيْلِ وَهُوَ يَسِيرُ لَا يُبَالِي حَيْثُ كَانَ وَجْهُه»  

nasai-kubra:950 – ʿĪsá b. Ḥammād > Ibn Wahb > Yūnus > Ibn Shihāb > Sālim > ʿAbdullāh

Salim b. 'Abdullah reported on the authority of his father that the Messenger of Allah (may peace be. upon him) used to observe Nafl (supererogatory) prayer on his ride no matter in what direction it turned its face, and he observed Witr too on it, but did not observe obligatory prayer on it. (Using translation from Muslim 700i)  

الكبرى للنسائي:٩٥٠ – أَخْبَرَنَا عِيسَى بْنُ حَمَّادٍ قَالَ أَخْبَرَنَا ابْنُ وَهْبٍ قَالَ أَخْبَرَنِي يُونُسُ عَنِ ابْنِ شِهَابٍ عَنْ سَالِمٍ عَنْ عَبْدِ اللهِ قَالَ

«كَانَ رَسُولُ اللهِ ﷺ يُسَبِّحُ عَلَى الرَّاحِلَةِ قِبَلَ أَيِّ وَجْهٍ تَوَجَّهُ وَيُوتِرُ عَلَيْهَا غَيْرَ أَنَّهُ لَا يُصَلِّي عَلَيْهَا الْمَكْتُوبَةَ»