Hisnul Muslim, also known as the Fortress of the Muslim, is a comprehensive compilation of supplications and prayers derived from Islamic teachings. Based on the Qur'an and Hadith, it covers various aspects of a Muslim's daily life. The book provides original Arabic text, transliteration, and translations in multiple languages for easy understanding and recitation by Muslims of diverse linguistic backgrounds.

Organized thematically, Hisnul Muslim includes prayers for morning and evening, specific occasions, protection from evil, seeking forgiveness, and guidance. It also features supplications for various situations like before and after prayer, sleeping, waking up, eating, traveling, and during times of difficulty. Widely used worldwide, this book serves as a practical guide for Muslims to incorporate supplications into their routines and deepen their spiritual connection with Allah.