Hawzah News Agency - Ahmad ibn Idris has narrated from Muhammad ibn Hassa’n from Idris ibn al-Hassan from abu Ishaq al-Kindi from Bashir al-Dahhan that Abu ‘Abdillah (al-Sadiq) said:

لا خَيْرَ فِيمَنْ لا يَتَفَقَّهُ مِنْ أَصْحَابِنَا يَا بَشِيرُ إِنَّ الرَّجُلَ مِنْهُمْ إِذَا لَمْ يَسْتَغْنِ بِفِقْهِهِ احْتَاجَ إِلَيْهِمْ فَإِذَا احْتَاجَ إِلَيْهِمْ أَدْخَلُوهُ فِي بَابِ ضَلالَتِهِمْ وَهُوَ لا يَعْلَمُ.

'There is no goodness in our people who do not learn fiqh (jurisprudence), oh Bashir. Indeed, when a man from them does not suffice himself with [knowledge] of fiqh, he becomes dependent on them (i.e. the non-shias). And when he becomes dependent on them, they lead him into the door of their misguidance, and he does not know.'

Al-Kāfi, v.1