حَدَّثَنَا أَبُو سَلَمَةَ أَخْبَرَنَا سُلَيْمَانُ عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ عَنِ ابْنِ عُمَرَ أَنَّهُ كَانَ يُصَلِّي عَلَى رَاحِلَتِهِ فِي السَّفَرِ حَيْثُمَا تَوَجَّهَتْ بِهِ وَذَكَرَ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ كَانَ يَصْنَعُ ذَلِكَ فِي السَّفَرِ
مسند امام احمد بن حنبل · Hadith 5406
It was narrated from Ibn 'Umar that he used to pray atop his mount no matter what direction it was facing and he said that the Prophet (PBUH) used to do that when travelling.
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020
Sanad
حَدَّثَنَا أَبُو سَلَمَةَ أَخْبَرَنَا سُلَيْمَانُ عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ عَنِ ابْنِ عُمَرَ