Nahj al-Balāgha
Hadith 1715١٠٧. وَقَالَ (عليه السلام): رُبَّ عَالِمٍ قَدْ قَتَلَهُ جَهْلُهُ وَعِلْمُهُ مَعَهُ لَا يَنْفَعُهُ.
107. Amīr al-mu’minīn, peace be upon him, said: Often the ignorance of a learned man ruins him while the knowledge he has does not avail him.