Ibn Sina's Original Demonstration in Proving the Necessary Existent

It is known that Ibn Sina Has mentioned three arguments to prove the necessary of existent, that is the argument from causality, from movement, and the argument from necessity and possibility. With a little reflection, it becomes clear that none of these arguments are Ibn Sina's innovative demonstration and are clearly stated in the works of Aristotle, Kindi and Farabi. What is Ibn Sina's original demonstration in proving the necessity of existence is the argument that is requisite for his philosophical system, that is, the demonstration based on the rational analysis of "existence" which can be called the Ibn Sinai demonstration. Ibn Sina, by rational analysis of existence as rational truth, proves the being of necessary existent and divine attributes and actions. Whereas in the above three proofs, with the presumption of possible existence, God is proved. In this article, we show with arguments and  the evidences that Ibn Sina's main and innovative argument is based on his theory about existence. Existence in Ibn Sina's thought is a metaphysical and a priori truth. contemplating on Ibn Sina's theory about existence makes it clear that his argument is not of Anselm and Descartes' argument and is not subject to Kant's criticism. On this basis, Ibn Sina is the first to present an existential argument that, while preceding philosophers such as Anselm, is also significantly different from them.