Victory is in protecting al-Islam
Al-Kāfi|Volume 8|Book 1|Chapter 139
مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ عِيسَى عَنْ عَلِيِّ بْنِ الْحَكَمِ عَنْ هِشَامِ بْنِ سَالِمٍ عَنْ أَبِي عَبْدِ اللَّهِ (عليه السلام) قَالَ مَا الْتَقَتْ فِئَتَانِ قَطُّ مِنْ أَهْلِ الْبَاطِلِ إِلَّا كَانَ النَّصْرُ مَعَ أَحْسَنِهِمَا بَقِيَّةً عَلَى أَهْلِ الْإِسْلَامِ.
139. Muhammad Bin Yahya, from Ahmad Bin Muhammad Bin Isa, from Ali Bin Al-Hakam, from Hisham Bin Salim, who has narrated the following: Abu Abdullah عليه الصلاة والسلام said: ‘No two groups of the people of falsehood ever confronted each other at all except that the victory was with the better one of them, while the other way round (opposite) being for the people of Al-Islam’.
- Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (15/372)
- Ṣaḥīḥ al-Kāfī, vol. 3, p. 388