Al-Kāfi
Hadith 3468ـ عَنْهُ عَنِ ابْنِ فَضَّالٍ قَالَ سَمِعْتُ أَبَا الْحَسَنِ (عَلَيهِ السَّلام) يَقُولُ مَا الْتَقَتْ فِئَتَانِ قَطُّ إِلا نُصِرَ أَعْظَمُهُمَا عَفْواً.
8. It is narrated from him (narrator of the Hadith above) from ibn Faddal who has said the following: “I heard abu al-Hassan (a.s.) saying, ‘Whenever two hostile parties face each other, the one who forgives to a greater degree comes out victorious.’”