This comprehensive single-volume work by Khair Al-Din Wanli delves into the pivotal role of the mosque in Islam. The book meticulously explores the various rulings (ahkam) associated with the mosque, from its construction to the conditions of prayer within it. It also details the proper etiquettes (adab) for Muslims inside its sacred walls, fostering a respectful and spiritual atmosphere. Furthermore, the author critically examines and warns against religious innovations (bid'ah) that have emerged in mosque-related practices, guiding readers toward authentic traditions. It stands as an essential resource for a complete understanding.