Prayer During Travel
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 59
وَ سَأَلَ سَعِيدُ بْنُ يَسَارٍ أَبَا عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ: عَنِ اَلرَّجُلِ يُصَلِّي صَلاَةَ اَللَّيْلِ وَ هُوَ عَلَى دَابَّتِهِ أَ لَهُ أَنْ يُغَطِّيَ وَجْهَهُ وَ هُوَ يُصَلِّي قَالَ «أَمَّا إِذَا قَرَأَ فَنَعَمْ وَ أَمَّا إِذَا أَوْمَأَ بِوَجْهِهِ لِلسُّجُودِ فَلْيَكْشِفْهُ حَيْثُ مَا أَوْمَأَتْ بِهِ اَلدَّابَّةُ.
Sa'id ibn Yasarasked Imam Jafar ibn Muhammad Al-Sadiq عليه السلام about a man performing the night prayer while on his mount. He asked: "Is it permissible for him to cover his face while praying?" He عليه السلام replied: "Yes, when he is reciting (the Qur'an). However, when he gestures with his face for prostration, he should uncover it wherever the mount takes him”.
- Ṣaḥīḥ al-Faqīh, p. 65