Arabic (Original)
حَدَّثَنَا مُعْتَمِرُ بْنُ سُلَيْمَانَ عَنْ عُبَيْدِ اللَّهِ عَنْ نَافِعٍ قَالَ رَأَيْتُ ابْنَ عُمَرَ يُصَلِّي عَلَى دَابَّتِهِ التَّطَوُّعَ حَيْثُ تَوَجَّهَتْ بِهِ فَذَكَرْتُ لَهُ ذَلِكَ فَقَالَ رَأَيْتُ أَبَا الْقَاسِمِ يَفْعَلُهُ.
English Translation
Mu'tamir ibn Sulayman told us, from Ubaydullah, from Nafi', who said: I saw Ibn Umar praying the voluntary prayer on his mount, wherever it turned, and I mentioned that to him, so he said: "I saw Abu al-Qasim do it."