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Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
muslim:502b – Abū Bakr b. Abū Shaybah And Ibn Numayr > Abū Khālid al-Aḥmar > ʿUbaydullāh > Nāfiʿ > Ibn ʿUmar

The Apostle of Allah ﷺ used to say prayer towards his camel. Ibn Numair said: The Apostle of Allah ﷺ said prayer towards the camel.  

مسلم:٥٠٢b – حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ وَابْنُ نُمَيْرٍ قَالاَ حَدَّثَنَا أَبُو خَالِدٍ الأَحْمَرُ عَنْ عُبَيْدِ اللَّهِ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ

أَنَّ النَّبِيَّ ﷺ كَانَ يُصَلِّي إِلَى رَاحِلَتِهِ وَقَالَ ابْنُ نُمَيْرٍ إِنَّ النَّبِيَّ ﷺ صَلَّى إِلَى بَعِيرٍ  

See similar narrations below:

Collected by Dārimī
darimi:1452 – al-Ḥakam b. al-Mubārak And ʿAbd Allāh b. Saʿīd > Abū Khālid al-Aḥmar > ʿUbaydullāh > Nāfiʿ > Ibn ʿUmar

It was narrated from Ibn ‘Abbas that the Prophet ﷺ used to pray Witr while riding his mount. (Using translation from Ibn Mājah 1201)   

الدارمي:١٤٥٢ – أَخْبَرَنَا الْحَكَمُ بْنُ الْمُبَارَكِ وَعَبْدُ اللَّهِ بْنُ سَعِيدٍ عَنْ أَبِي خَالِدٍ الْأَحْمَرِ عَنْ عُبَيْدِ اللَّهِ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ

أَنَّ النَّبِيَّ ﷺ كَانَ «يُصَلِّي إِلَى رَاحِلَتِهِ»