حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ حَدَّثَنَا شُعْبَةُ عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ قَالَ رَأَيْتُ ابْنَ عُمَرَ يُصَلِّي حَيْثُ تَوَجَّهَتْ بِهِ رَاحِلَتُهُ وَيَقُولُ كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَفْعَلُهُ
مسند امام احمد بن حنبل · Hadith 5529
It was narrated that 'Abdullah ibn Dinar said: I saw Ibn 'Umar pray (naafil) atop his mount no matter what direction it was facing, and he said: The Messenger of Allah (PBUH) used to do that.
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020
Sanad
حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ حَدَّثَنَا شُعْبَةُ عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ