Al-Kāfi

Hadith 75
intellect
2ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ بَعْضِ أَصْحَابِهِ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ السَّلام) قَالَ إِذَا مَاتَ الْمُؤْمِنُ الْفَقِيهُ ثُلِمَ فِي الاسْلامِ ثُلْمَةٌ لا يَسُدُّهَا شَيْ‏ءٌ.
2. Ali ibn Ibrahim has narrated from his father from Ibn Abi ‘Umayr from one of his people that Abu ‘Abdillah (al-Sadiq) (as) said: “When a believer who is a Faqih dies, it causes irreparable damage in the Islamic system."
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī