Understanding of revelation

The recognizing of revelation and the quality of its downturn on the heart of the Prophet Mohammad (p,b,u,h) is very important in Islamic culture, so Mullah Sadra Shirazi believed that it is necessary for any faithful to understand what that sent down to prophets and it is necessary to any Islamic scientist to understand the decline the revelation to any prophet in the history. This article has done by the library- analytic way with reference to Islamic works and sources. This article aimed to justify and interpret the definition of revelation, forms of decline in the Holy Quran as a main revealed book and comments of Islamic commentators and theologians about the way of receiving the Holy Quran. It seems that, there are differences means between the theologian application of revelation and the Quranincs one. sending down the meaning of Quran and the words of It both of them has send to hurt of Prophet, and none of these two concepts should not be separated from the concept of decline in the Holy Quran. The theory of verbal decline has very Reliability and validity for Muslim Theologian and commentators.