Al-Kāfi - Volume 1 > Chapter on the quality of knowledge its virtue and the virtue of the scholars
Hadith #4

4ـ مُحَمَّدُ بْنُ إِسْمَاعِيلَ عَنِ الْفَضْلِ بْنِ شَاذَانَ عَنْ حَمَّادِ بْنِ عِيسَى عَنْ رِبْعِيِّ بْنِ عَبْدِ الله عَنْ رَجُلٍ عَنْ ابي جعفر (عَلَيْهِ السَّلام) قَالَ قَالَ الْكَمَالُ كُلُّ الْكَمَالِ التَّفَقُّهُ فِي الدِّينِ وَالصَّبْرُ عَلَى النَّائِبَةِ وَتَقْدِيرُ الْمَعِيشَةِ.

4. Muhammad ibn ’Isma‘il has narrated from Fadl ibn Shadhan from Hammad ibn ‘Isa from Rab‘i ibn ‘Abdallah from a man from abu Ja‘far (a.s.) who has said the following. “The entirety of excellence and perfection is (a) in good understanding of religion, (b) exercise of patience in affliction and (c) setting up of means of living.”