Al-Kāfi - Volume 1 > Chapter on Utilization of Knowledge
Hadith #2

2ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ مُحَمَّدِ بْنِ سِنَانٍ عَنْ إِسْمَاعِيلَ بْنِ جَابِرٍ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ السَّلام) قَالَ الْعِلْمُ مَقْرُونٌ إِلَى الْعَمَلِ فَمَنْ عَلِمَ عَمِلَ وَمَنْ عَمِلَ عَلِمَ وَالْعِلْمُ يَهْتِفُ بِالْعَمَلِ فَإِنْ أَجَابَهُ وَإِلا ارْتَحَلَ عَنْهُ.

2. Muhammad ibn Yahya from Ahmad ibn Muhammad from Muhammad ibn Sinan from ‘Isma’il ibn Jabir from abu ‘Abdallah (a.s.) who has said the following. “Knowledge and work are closely related. One who has knowledge he works and one who works he learns. Knowledge invites work and if it is not accepted knowledge departs the deeds.”