Al-Kāfi - Volume 1 > Chapter on the necessity to seek knowledge and the recommendations to learn
Hadith #1

1ـ أَخْبَرَنَا مُحَمَّدُ بْنُ يَعْقُوبَ عَنْ عَلِيِّ بْنِ إِبْرَاهِيمَ بْنِ هَاشِمٍ عَنْ أَبِيهِ عَنِ الْحَسَنِ بْنِ أَبِي الْحُسَيْنِ الْفَارِسِيِّ عَنْ عَبْدِ الرَّحْمَنِ بْنِ زَيْدٍ عَنْ أَبِيهِ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ السَّلام) قَالَ قَالَ رَسُولُ الله (صَلَّى اللهُ عَلَيْهِ وَآلِه) طَلَبُ الْعِلْمِ فَرِيضَةٌ عَلَى كُلِّ مُسْلِمٍ أَلا إِنَّ الله يُحِبُّ بُغَاةَ الْعِلْمِ.

1. Muhammad ibn Ya‘qub has narrated from Ali ibn Ibrahim ibn Hashim from his father from al-Hassan ibn abu al-Hassan al-Farisi from ‘Abd al-Rahman ibn Ziyad from his father from abu ‘Abdallah (a.s.) who has said the following. “The Messenger of Allah said, ‘Seeking knowledge is obligatory for every Muslim. Let it be known that Allah loves those who seek knowledge.”