The author seeks an explanation for the genesis of onto-theology ascribed to Aristotle’s “first philosophy”, and points to Philo of Alexandria, who explicitly refers Aristotle’s formula to on hē on (Being as Being) directly to the God of the Bible. Moreover, the discovery is that the use of such a formula demonstrates Philo’s inspiration by the Book Kappa of the Metaphysics. The author argues that this book was not written by Aristotle (see studies by Natorp, and Aubenque). Thus, the concept of Being used with reference to God cannot be ascribed to Aristotle but rather to the compiler of the Book K. Therefore, the originator of onto-theology is Philo not Aristotle, and it is Aristotle who under the “Being as Being” formula recommends considering Being in the sense of any object that can be studied and defined scientifically (see the Book Gamma of the Metaphysics).