As for the saying: “Whosoever's guide is his book then his err | IlmTest

As for the saying: “Whosoever's guide is his book then his error(s) will be more than what he is correct in” - then this is not totally correct and nor totally incorrect.
وأما قوله: " من كان دليله كتابه فخطؤه أكثر من صوابه "، فهذا ليس صحيحًا على إطلاقه ولا فاسدَا على إطلاقه،

As for the person who takes knowledge from any book he sees, then no doubt he will err abundantly.
أما الإنسان الذي ياخذ العلم من أي كتاب يراه فلاشك أنه يخطئ كثيرَا،

And as for the one who in his learning depends upon the books of men known for trustworthiness, reliability and knowledge then this person's errors will not be many and will be correct in the majority of what he says.
وأما الذيْ يعتمد في تعلمه على كتب رجال معروفين بالثقة والأمانة والعلم فإن هذا لا يكثر خطؤه بل قد يكون مصيبَا في أكثر ما يقول.

Muḥammad b. Ṣāliḥ al-ʿUthaymīn, Majmūʿ al-Fatāwá wa Rasāʿil 26/197
ابن عثيمين، مجموع فتاوى ورسائل ٢٦/١٩٧
https://shamela.ws/book/12293/10783

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