This article is devoted to the analysis of vahdad ul vujud concept in the spiritual heritage of the great medieval thinker Alisher Navoi. Within the framework of this concept the world is subdivided into two hypostases, the first of which implies necessary being or wajib ul wujud, by which Allah is meant, and the second one implies possible being, by which acidentia is meant. It should be noted that these two hypostases are in no way opposed to each other, but like yin and yang are interrelated.