https://burjis.com/index.php/burjis <p style="font-weight: 400;">Bannu University Research Journal in Islamic Studies (BURJIS) is a bi-annual research journal in Islamic Studies. The journal is trilingual (Arabic, English, Urdu) published by Department of Islamic Studies &amp; Research, University of Science &amp; Technology Bannu. It is a double blind peer reviewed and open access journal. It was established in 2014 and the journal was initially recognized by Higher Education Commission (HEC) Pakistan in “Y” category and going to be upgrade soon (in sha Allah) in “X” category.</p> <p style="font-weight: 400;">BURJIS is zealous to the promotion of intellectual study of Islam and the Muslim world. It is pertinent to mention that the journal encourages the research in the field of Socio-Religious issues.</p> University of Science and Technology Bannu en-US Bannu University Research Journal in Islamic Studies 2411-4332 https://burjis.com/index.php/burjis/article/view/329 <p class="PreformattedText" style="margin-bottom: 6.0pt; text-align: justify;"><span style="font-size: 12.0pt; font-family: 'Times New Roman','serif';">The science of hidden defects in Hadith (ʿIlal al‑Hadith) is among the most precise and delicate sciences of the Prophetic tradition. It investigates subtle causes that undermine the authenticity of a narration despite its outward soundness. This study aims to clarify the importance of the science of ʿilal, explain the four pillars upon which it is based, present the scientific methodology for studying defective reports, and explain the categories of defects and the ways scholars detect them. The study also provides practical examples from books on defects and introduces the most significant works and scholars in this field. The findings show that knowledge of defects is attainable only by master memorizers who collect the various chains and compare them, and that mastering this science is essential to preserve the Sunnah and purify its traditions. Since the <strong>absence of a defect is the fifth and final condition of a sahih (authentic) hadith</strong>, the study stresses that judging a narration as authentic is not achieved merely through connected chains, upright and precise narrators and freedom from contradiction (shudhudh); rather, the researcher must also ascertain that it is free from any hidden flaw. This last condition is the most difficult, because the defect is not apparent and is known only to expert critics.</span></p> Dr Noor Ur Rahman Hazarvi Muhammad Haris Suhaib Copyright (c) 2025 Bannu University Research Journal in Islamic Studies 2025-08-31 2025-08-31 12 02 1 8