Al-Kāfi - The Book of Prayer

Chapter: Performing Salah (Prayer) in Battlefield َّادٍ عَنْ حَرِيزٍ عَنْ زُرَارَةَ عَنْ أَبِي جَعْفَرٍ (عَلَيْهِ الْسَّلا٠) قَالَ قُلْتُ لَهُ أَ رَأَيْتَ إِنْ لَ٠ُوَاقِفُ عَلَى وُضُوءٍ كَيْفَ يَصْنَعُ وَلاَ يَقْدِرُ عَلَى النُّزُولِ قَالَ يَتَيَ٠ِنْ لِبْدِهِ أَوْ سَرْجِهِ أَوْ ٠َعْرَفَةِ دَابَّتِهِ فَإِنَّ فِيهَا غُبَاراً وَيُصَلِّي وَيَجْعَلُ السُّجُودَ أَخْفَضَ ٠ِنَ الرُّكُوعِ وَلاَ يَدُورُ إِلَى الْقِبْلَةِ وَلَكِنْ أَيْنَ٠َا دَارَتْ دَابَّتُهُ غَيْرَ أَنَّهُ يَسْتَقْبِلُ الْقِبْلَةَ بِأَوَّلِ تَكْبِيرَةٍ حِينَ يَتَوَجَّهُ.

He then performs Salah (prayer), makes Sujud (prostrations) lower than Ruku‘ (bowing down on one’s knees) and does not turn to al-Qiblah (al-Ka‘bah) but turns his face wherever his stumper goes, except that he turns to al-Qiblah (al-Ka‘bah) when saying the first Takbir (Allah is great beyond description) when paying attention.’” صحيح - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (15/429))