Haqqul Yaqeen is a comprehensive theological work by Allama Muhammad Baqir Majlisi, one of the most renowned Shia scholars. This book covers essential Islamic beliefs, delving into topics such as the nature of prophethood, the concept of the afterlife, resurrection, and divine judgment. The author provides extensive references from the Quran and Hadith, emphasizing the importance of true faith (Yaqeen) and certainty in these fundamental principles. Through profound discussions on the attributes of God, human accountability, and the path to salvation, Haqqul Yaqeen serves as a guiding text for those seeking to strengthen their understanding of Islamic teachings and ethical responsibilities.