The People Well-grounded in Knowledge are the Imams عليه السلام alone

2. Ali ibn Muhammad has narrated from ‘Abdallah ibn Ali from Ibrahim ibn Ishaq from ‘Adallah ibn Hammad from Burayd ibn Mu‘awiya who has narrated the following from either one of the Imams عليه السلام about the words of Allah the Most Majestic and Most gracious: “No one knows its true interpretations except God and those who have a firm grounding in knowledge...” (3:7). The Messenger of Allah صلى الله عليه وعلى آله وسلم is the best among those who are well-grounded in knowledge. Allah, the Most Majestic and Most gracious, taught him all that He had revealed to him in the form of original text and in the form of interpretations. Allah, the Most Majestic and Most gracious, would not reveal anything to him that he would not know the meaning thereof. His successors after him knew all revelations. As for those who do not know the interpretations thereof, when the scholar speaks to them with knowledge, they say, “We believe in it, for all of this is from our Lord.” The Holy Quran consists of specific, general, clear, not so clear, abrogating and abrogated statements. The people who are well-grounded in knowledge know (all of) it.”

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.”