Al-Kāfi - Volume 1 > The issue that Allah’s holding people accountable remains unjustified without the Imam
Hadith #2

2ـ الْحُسَيْنُ بْنُ مُحَمَّدٍ عَنْ مُعَلَّى بْنِ مُحَمَّدٍ عَنِ الْحَسَنِ بْنِ عَلِيٍّ الْوَشَّاءِ قَالَ سَمِعْتُ الرِّضَا (عَلَيْهِ السَّلام) يَقُولُ إِنَّ أَبَا عَبْدِ الله (عَلَيْهِ السَّلام) قَالَ إِنَّ الْحُجَّةَ لا تَقُومُ لله عَزَّ وَجَلَّ عَلَى خَلْقِهِ إِلا بِإِمَامٍ حَتَّى يُعْرَفَ.

2. Al-Husayn ibn Muhammad has narrated from Mu‘alla ibn Muhammad from al-Hassan ibn Ali al-Washsha’ who has said the following. “Allah’s holding people accountable remains unjustified without the Imam who would teach people about Him.”