حَدَّثَنَا عَبْدُ الْأَعْلَى عَنْ مَعْمَرٍ عَنْ الزُّهْرِيِّ عَنْ سَالِمٍ عَنِ ابْنِ عُمَرَ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ كَانَ يُصَلِّي عَلَى رَاحِلَتِهِ حَيْثُ تَوَجَّهَتْ بِهِ
مسند امام احمد بن حنبل · Hadith 4518
It was narrated from Saalim, from Ibn 'Umar, that the Messenger of Allah (PBUH) used to pray on his mount in whatever direction it was facing.
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020