Sa'eed Ali Wahf al-Qahtani was a respected Islamic scholar from Saudi Arabia, best known for his widely circulated book “Hisnul Muslim” (Fortress of the Muslim)—a collection of authentic supplications (duas) from the Qur’an and Sunnah. The book has been translated into many languages and is cherished by Muslims around the world for its concise, practical guidance on daily prayers and remembrance of Allah.