Al-Kāfi

Hadith 42
intellect
5ـ عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ الْبَرْقِيِّ عَنْ يَعْقُوبَ بْنِ يَزِيدَ عَنْ أَبِي عَبْدِ الله رَجُلٍ مِنْ أَصْحَابِنَا رَفَعَهُ قَالَ قَالَ أَبُو عَبْدِ الله (عَلَيْهِ السَّلام) قَالَ رَسُولُ الله (صَلَّى اللهُ عَلَيْهِ وَآلِه) طَلَبُ الْعِلْمِ فَرِيضَةٌ وَفِي حَدِيثٍ آخَرَ قَالَ قَالَ أَبُو عَبْدِ الله (عَلَيْهِ السَّلام) قَالَ رَسُولُ الله (صَلَّى اللهُ عَلَيْهِ وَآلِه) طَلَبُ الْعِلْمِ فَرِيضَةٌ عَلَى كُلِّ مُسْلِمٍ أَلا وَإِنَّ الله يُحِبُّ بُغَاةَ الْعِلْمِ.
5. A number of our people has narrated has narrated from Ahmad ibn Muhammad al-Barqi from Ya’qub ibn Yazid from Abu ‘Abdillah, one of our people narrated in a marfu‘ manner from Abu ‘Abdillah (al-Sadiq) (as) that Rasulullah (sw) said: “Seeking knowledge is obligatory.” In another hadith, Abu 'Abdillah (as) narrated that Rasulullah (sw) said, “Seeking knowledge is obligatory for every Muslim. Let it be known that Allah loves those who seek knowledge.”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī