This research explores Ottoman Hadith scholarship, tracing its origins, evolution, and critique within the context of the empire's intellectual and religious heritage. It examines the process of Sunnization, highlighting the pivotal role of Hadith scholarship in preserving Islamic knowledge and promoting Sunni orthodoxy. Through a case study on Ismail Haqqi Bursawi's commentary on Nawawi's 40 Hadith, it elucidates the content and influence of Ottoman Islamic thought. Hadith, alongside the Quran, form a significant source in Islamic jurisprudence, offering guidance on religious practices and reflecting the Prophet's teachings. The study reveals the development of Hadith scholarship in the Ottoman Empire, influenced by historical events and interactions with scholars from diverse backgrounds. It discusses the tradition of compiling forty Hadith, symbolically significant in Islamic practices and beliefs, and analyzes Bursawi's commentary as a substantial Turkish work, providing valuable insights for students of knowledge. The dissertation compares Bursawi's commentary with other works, highlighting its depth and breadth of analysis, and concludes by emphasizing its contribution to understanding the forty Hadith within the Ottoman scholarly tradition.