عَنْ جَمِيلٍ عَنْ أَبِي عَبْدِ اللَّهِ [عَليْه السَّلامُ] قَالَ سَمِعْتُهُ يَقُولُ:
«الْمُؤْمِنُونَ خَدَمٌ بَعْضُهُمْ لِبَعْضٍ» قُلْتُ: وَكَيْفَ يَكُونُونَ خَدَماً بَعْضُهُمْ لِبَعْضٍ؟ قَالَ: «يُفِيدُ بَعْضُهُمْ بَعْضاً».
— أصـول الكافـي
Jamīl that Abū 'Abdillah ('a.s) said: I [Jamīl] heard him saying:
"Believers are of service to each other." I said: "How can they be of service to each other?" He ['a.s.] said: "They are of benefit to each other..."
— Usul al-Kāfī
