The Sufficient (Vol 1) · Hadith 43 (#Ḥadīth #7)

7ـ الْحُسَيْنُ بْنُ مُحَمَّدٍ عَنْ جَعْفَرِ بْنِ مُحَمَّدٍ عَنِ الْقَاسِمِ بْنِ الرَّبِيعِ عَنْ مُفَضَّلِ بْنِ عُمَرَ قَالَ سَمِعْتُ أَبَا عَبْدِ الله يَقُولُ عَلَيْكُمْ بِالتَّفَقُّهِ فِي دِينِ الله وَلا تَكُونُوا أَعْرَاباً فَإِنَّهُ مَنْ لَمْ يَتَفَقَّهْ فِي دِينِ الله لَمْ يَنْظُرِ الله إِلَيْهِ يَوْمَ الْقِيَامَةِ وَلَمْ يُزَكِّ لَهُ عَمَلاً.

7. Al-Hassan ibn Muhammad has narrated from Ja‘far ibn Muhammad from al-Qasim ibn al-Rabi‘ from Mufaddal ibn ‘Umar that he heard Abu ‘Abdillah (al-Sadiq) say, "It is necessary for you to have good understanding of religion of Allah. Do not be like Bedouins because those who do not gain good understanding of religion, Allah will not look to then on the Day of Judgement and none of his deeds will be cleansed."

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).