One of the most complex topics in divine philosophy is the issue of divine knowledge. This article examines the views of Sadr al-Muta'allehin and Ibn Sina while stating issues related to this issue. Ibn Sina considers the divine knowledge of essence to be present. He considers the divine knowledge of Masavi to be an acquired science which is obtained through the forms of Mortasmeh, therefore he believes in the science of Enai. Mulla Sadra, using the special principles of his philosophy, including the rule of "Basit Al-Haghighat", has presented a new theory about the obligatory divine knowledge to Masavi. Accordingly, God, at the level of His essence, has a brief (simple) knowledge of all of Masavi, who is at the same time the discoverer of Masavi's details. He also defends the essence and necessity of divine knowledge based on his philosophical principles.