Al-Kāfi - The Book of Prayer

Chapter: Performing Salah (Prayer) in Battlefield َّدُ بْنُ يَحْيَى عَنْ أَحْ٠َانَ بْنِ عِيسَى عَنْ سَ٠َاعَةَ قَالَ سَأَلْتُهُ عَنْ صَلاَةِ الْقِتَالِ فَقَالَ إِذَا الْتَقَوْا فَاقْتَتَلُوا فَإِنَّ الصَّلاَةَ حِينَئِذٍ التَّكْبِيرُ وَإِنْ كَانُوا وُقُوفاً لاَ يَقْدِرُونَ عَلَى الْجَ٠َاعَةِ فَالصَّلاَةُ إِي٠5.

Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from ‘Uthman ibn ‘Isa from Sama‘ah who has said the following: “I once asked him (the Imam) (a.s.), about Salah (prayer) during fighting.

He (the Imam) said, ‘If they meet (the armies) and kill each other, then Salah (prayer) in such time is Takbir (Allah is great beyond description), but if they are standing and are not able to overpower the group, then it is in the form of gestures.’” وثق - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (15/429))