The Book of Prayer by Ibn Qayyim al-Jawziyya is a profound work of Islamic jurisprudence and spirituality. It addresses the rulings and spirituality of prayer, delves into its virtues, and discusses the most important issues concerning those who abandon it, the importance of humility and devotion, and describes the prayer of the Prophet (peace and blessings be upon him). It combines jurisprudence with practical Sufism, and reviews the differences of opinion among scholars on subtle issues such as the ruling on those who abandon prayer, their execution, and the prescribed punishments. It also clarifies how to perform prayer with humility and contemplation. The application works offline and has a small file size.