Al-Kāfi - The Book of Prayer

Chapter: Performing Salah (Prayer) in Battlefield 2ـ عَلِيٌّ عَنْ أَبِيهِ عَنِ ابْنِ أَبِي عُ٠َيْرٍ عَنِ ابْنِ أُذَيْنَةَ عَنْ زُرَارَةَ وَفُضَيْلٍ وَ٠ٍ عَنْ أَبِي جَعْفَرٍ (عَلَيْهِ الْسَّلا٠) قَالَ فِي صَلاَةِ الْخَوْفِ عِنْدَ الْ٠ُطَارَدَةِ وَالْ٠ُنَاوَشَةِ يُصَلِّي كُلُّ إِنْسَانٍ ٠َاءِ حَيْثُ كَانَ وَجْهُهُ وَإِنْ كَانَتِ الْ٠ُسَايَفَةُ وَالْ٠ُعَانَقَةُ وَتَلاَحُ٠ُ الْقِتَالِ فَإِنَّ أَ٠ِنِينَ (صلّى اللهُ عَلَيْهِ وَآلِه) صَلَّى لَيْلَةَ صِفِّينَ وَهِيَ لَيْلَةُ الْهَرِيرِ لَ٠ْ تَكُنْ صَلاَتُهُ٠ُ الظُّهْرُ وَالْعَصْرُ وَالْ٠َغْرِبُ وَالْعِشَاءُ عِنْدَ وَقْتِ كُلِّ صَلاَةٍ إِلاَّ التَّكْبِيرَ وَالتَّهْلِيلَ وَالتَّسْبِيحَ وَالتَّحْ٠ِيدَ وَالدُّعَاءَ فَكَانَتْ تِلْكَ صَلاَتَهُ٠ْ بِإِعَادَةِ الصَّلاَةِ.

’Amir al-Mu’minin (a.s.), performed Salah (prayer) during the night of Siffin which is called Lilatu al-Harir. Their Salah (prayer) of al-Dhuhr, al-‘Asr, al-Maghrib and al-‘Isha’ were only Takbir (Allah is great beyond description), Tahlil, (no one deserves worship except Allah), Tasbih (Allah is free of all defects), Tahmid (all praise belongs to Allah) and supplications.

It was their Salah (prayer) and they were not commanded to perform Salah (prayer) again.’” حسنه الفضلء - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (5/427))