Noorul Yaqeen (Light of Certainty), authored by the renowned scholar Allama Muhammad Al-Khudari
Authentic digital editions usually retain the print book's ISBN (e.g., 978-81-....). If the PDF lacks an ISBN, treat it with suspicion.
Unverified PDFs often suffer from OCR (Optical Character Recognition) errors. A single misprinted Arabic or Malayalam word can change the meaning of a Hadith or a verse of the Quran quoted in the text. A verified file confirms that the text matches a certified printed edition.