Al-Kāfi - Volume 2 > In the Sen’ice of Believing People
Hadith #1

1ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ سَلَمَةَ بْنِ الْخَطَّابِ عَنْ إِبْرَاهِيمَ بْنِ مُحَمَّدٍ الثَّقَفِيِّ عَنْ إِسْمَاعِيلَ بْنِ أَبَانٍ عَنْ صَالِحِ بْنِ أَبِي الأسْوَدِ رَفَعَهُ عَنْ أَبِي الْمُعْتَمِرِ قَالَ سَمِعْتُ أَمِيرَ الْمُؤْمِنِينَ (عَلَيهِ السَّلام) يَقُولُ قَالَ رَسُولُ الله (صَلَّى اللهُ عَلَيْهِ وآلِه) أَيُّمَا مُسْلِمٍ خَدَمَ قَوْماً مِنَ الْمُسْلِمِينَ إِلا أَعْطَاهُ الله مِثْلَ عَدَدِهِمْ خُدَّاماً فِي الْجَنَّةِ.

1. Muhammad ibn Yahya has narrated from Salmah ibn Khattab from Ibrahim ibn Muhammad al-Thaqafi from Isma’il ibn Aban from Salih ibn abu al-Aswad in a marfu’ manner from abu al-Mu’tamar who has said the following: “I heard Amir al-Mu’minin (Ali ibn abu Talib) (a.s.) saying, ‘The Messenger of Allah has said, “Any Muslim who serves a group of Muslims, Allah in paradise will grant him servants equal to the number of Muslims he had served.’”