Hisnul Muslim(Fortress of the Muslim ) BY PROF.ISAH ALI IBRAHIM PANTAMI

Fortress of the Muslim" (also known as "Fortification of the Muslim"; Arabic: حصن المسلم من أذكار الكتاب والسنة, ḥiṣn al-Muslim min ad͟hkār wa l-sunna) is a compilation of supplications and invocations (dua) authored by Sa'id bin Ali bin Wahf Al-Qahtani.
This book is widely regarded as the most famous scripture of Adkhar and Dua from the teachings of the Messenger of Allah (swt). The original compilation is considered one of the most authentic collections available and has become the most popular Dua book in the Muslim world today.