The People Well-grounded in Knowledge are the Imams عليه السلام alone
Al-Kāfi|Volume 1|Book 4|Chapter 22
3ـ الْحُسَيْنُ بْنُ مُحَمَّدٍ عَنْ مُعَلَّى بْنِ مُحَمَّدٍ عَنْ مُحَمَّدِ بْنِ أُورَمَةَ عَنْ عَلِيِّ بْنِ حَسَّانَ عَنْ عَبْدِ الرَّحْمَنِ بْنِ كَثِيرٍ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ السَّلام) قَالَ الرَّاسِخُونَ فِي الْعِلْمِ أَمِيرُ الْمُؤْمِنِينَ وَالائِمَّةُ مِنْ بَعْدِهِ (عَلَيْهِ السَّلام )
3. Al-Husayn ibn Muhammad has narrated from MuAlia ibn Muhammad from Muhammad ibn ’Uwarma from Ali ibn Hassan from ‘Abd al-Rahman ibn Kathir from abu ‘bdallah عليه السلام who has said the following. “People well-grounded in Knowledge stands for Amir al-Mu’minin Ali عليه السلام and the Imams after him.”
- Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (2/436)
- Ṣaḥīḥ al-Kāfī