Warning Against Deviant Books and Authors

Question:
He says: There has become some ambiguity in the writings, books, and da'wah (calling) of some people, as well as in their fatwas (scholarly legal rulings) at times. This has led some of the youth to fall into the serious pitfall of takfir (declaring someone a disbeliever) and rebelling against the obedience and submission to the rulers. So how do we identify these people through their speech? And how do we warn against them and take knowledge only from the firmly rooted scholars?

Answer:
There is no doubt that books and authors differ in their methodologies. Each one writes and composes according to his own methodology, whether it is sound or not. The youth and students of knowledge must choose trustworthy teachers in their knowledge, their sincerity, and their methodology, so that you are safe. One should read their books.
And they should beware of those with differing, opposing methodologies, so that they do not study under them or read their books, because there is some hesitation and doubt in them, if it does not affect their direction. Once they have mastered the knowledge and gained a share of knowledge by which they can distinguish between the valid and the invalid, there is no harm in them looking at what has been written and composed, so that they may know the truth and spread it, and know the falsehood and warn against it. Yes.