What is the criterion for declaring specific individuals innovators?

Question:
May Allah reward you, Your Eminence, father. The questioner says: In our country, our scholars have declared certain individuals to be innovators by name. I am a young student of knowledge, but I am not fully convinced by this declaration of innovation. The scholars have also issued a ruling to boycott them, and I am not convinced by the boycott either. Then they asked me to teach in their mosques, so I refused based on what the scholars said about them. The question is: Will I be sinful if I cut off ties with them and boycott them, and advise people to boycott and cut off ties with them based on the words of the scholars of knowledge about them, despite my lack of conviction in that?

Answer:
Declaring someone an innovator is not the right of every person to declare innovation and rule with it. Rather, the declaration of innovation is based on the Book of Allah, the Sunnah of His Messenger, and the established scholars of knowledge who distinguish between innovation and other matters. The criterion for innovation, as it came in the hadith, is: So it was reported that innovation is what is newly introduced in the religion that is not part of it. This is innovation in the religion, whether it is in creed or in worship. Innovation is only taken from the Book and the Sunnah, and it is ruled upon by the scholars of knowledge, not by those who pretend to be scholars, the beginners, and the students, where each declares the other an innovator if he does not agree with him. This is not permissible; this is chaos. Yes. You, excuse me, Allah. And Allah the Exalted knows best.