Al-Kāfi - Volume 1 > Chapter on the quality of knowledge its virtue and the virtue of the scholars
Hadith #5

5ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ عِيسَى عَنْ مُحَمَّدِ بْنِ سِنَانٍ عَنْ إِسْمَاعِيلَ بْنِ جَابِرٍ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ السَّلام) قَالَ الْعُلَمَاءُ أُمَنَاءُ وَالاتْقِيَاءُ حُصُونٌ وَالاوْصِيَاءُ سَادَةٌ وَفِي رِوَايَةٍ أُخْرَى الْعُلَمَاءُ مَنَارٌ وَالاتْقِيَاءُ حُصُونٌ وَالاوْصِيَاءُ سَادَةٌ.

5. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad ibn ‘Isa from Muhammad ibn Sinan from ’Isma‘il ibn Jabir from abu ‘Abdallah (a.s.) who has said the following. “The scholars are trust worthy people, The pious ones are the strongholds and the successors (of the holy Prophet (s.a.) are the leaders.” In another Hadith it is said, “The scholars are the light houses, the pious people are the strongholds and the successors are the leaders.”