Al-Kāfi

Hadith 608
brotherhoodrightsworship
4ـ عَنْهُ عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنِ الْحَسَنِ بْنِ مَحْبُوبٍ عَنْ جَمِيلٍ عَنْ مُرَازِمٍ عَنْ أَبِي عَبْدِ الله (عَلَيهِ السَّلام) قَالَ مَا عُبِدَ الله بِشَيْ‏ءٍ أَفْضَلَ مِنْ أَدَاءِ حَقِّ الْمُؤْمِنِ.
4. It is narrated from him (narrator of the Hadith above) from Ahmad ibn Muhammad from al-Hassan ibn Mahbub from Jamil from Marazim from Abu ‘Abdillah (a.s.) who has said the following: “Allah the best way to worship is to fulfil (protect) the rights of the believer.”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī