Al-Kāfi - Volume 1 > Chapter on the Qualities of the Scholars
Hadith #7

7ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنْ عَلِيِّ بْنِ مَعْبَدٍ عَمَّنْ ذَكَرَهُ عَنْ مُعَاوِيَةَ بْنِ وَهْبٍ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ السَّلام) قَالَ كَانَ أَمِيرُ الْمُؤْمِنِينَ (عَلَيْهِ السَّلام) يَقُولُ يَا طَالِبَ الْعِلْمِ إِنَّ لِلْعَالِمِ ثَلاثَ عَلامَاتٍ الْعِلْمَ وَالْحِلْمَ وَالصَّمْتَ وَلِلْمُتَكَلِّفِ ثَلاثَ عَلامَاتٍ يُنَازِعُ مَنْ فَوْقَهُ بِالْمَعْصِيَةِ وَيَظْلِمُ مَنْ دُونَهُ بِالْغَلَبَةِ وَيُظَاهِرُ الظَّلَمَةَ.

7. Ali ibn Ibrahim has narrated from his father from Ali ibn Ma‘bad from the person whom he mentioned from Mu‘awiya ibn Wahab from abu ‘Abdallah (a.s.) who has said the following. “Imam Ali (a.s.), would often say, ‘O seekers of knowledge, (note that) a scholar has three signs: Knowledge, forbearance and quietness. An orator has three signs: He quarrels those higher then him through disobedience. He does injustice to those lower than him in position through domination and he becomes a supporter of the unjust.’”