The nature and function of Prayer in Monotheistic Religions With a comparative approach to three works of The Books of Psalms, Epistles of Saint Paul and Scroll of Al-Sajjād

Prayer is one of the most fundamental and most important characteristic of religions, especially the Monotheistic Religions that contain a large part of the literature of all faiths and has converted into a common language to communicate with Allah in Monotheistic Religions and has converted to a common language to communicate with Allah in Monotheistic Religions. In the main direction of the nature of every pious prayer, Allah stands that faith in His Oneness (Absolute Unity) and belief in Attributive Being (Entities of the attributes) in Him form the prayer. In other side of prayer, man stands that firstly, his presence and secondly the existence of need and necessity –even physical or spiritual- in him after the faith in Allah are the other fundamental aspects of forming every prayer. Accordingly, a triangle (trinity or trihedral determination) can be defined as the nature of prayer which has three corners: Allah, the man and the need. Naturally, these three corners are connected with three sides that according to the kind of human need change from physical trinityof prayer to spiritual trinityof prayer. Explication of this theory as the theory of the nature of prayer trinity and its functions in three great Monotheistic Religions: Judaism, Christianity and Islam, and comparative study of three main works (book) in these religions: the Book of Psalms, Epistles of Saint Paul and the Scroll of Al-Sajjād, derivation of common aspects and indicate to differences as following up to the theory of the nature of prayer trinity, are the subject matters of this research.