Al-Kāfi

Hadith 439
lovebrotherhood
14ـ عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ خَالِدٍ عَنْ عُثْمَانَ بْنِ عِيسَى عَنْ سَمَاعَةَ بْنِ مِهْرَانَ عَنْ أَبِي عَبْدِ الله (عَلَيهِ السَّلام) قَالَ إِنَّ الْمُسْلِمَيْنِ يَلْتَقِيَانِ فَأَفْضَلُهُمَا أَشَدُّهُمَا حُبّاً لِصَاحِبِهِ.
14. A number of our people have narrated from Ahmad ibn Muhammad ibn Khalid from ‘Uthman ibn ‘Isa from Sama’a ibn Mehran from Abu ‘Abdillah (a.s.) who has said the following: “Of the two Muslims who meet each other, the more meritorious is the one who loves his companion more intensely.”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī