One of ancient sects of Persia which once spread its realms outside Iran is the Manichean sect. Towards the end of Ashkanians’ reign in Babylonian Mardinu Mani was born and claimed himself a prophet but according to Shahnameh, he is a skilled painter who came from China to Iran during the Shapur Zolaktaf’s era. This information is not only incorrect but also according to the remarks attributed to Mani in a debate and provided by a certain Zoroaster priest about which Ferdowsi gives its account his statements do not agree with the Manichean beliefs. The priest introduces Mani as a believer in a God out of which light and darkness emerged from its core. This belief which the priest condemns Mani for belongs to Zorvanism and Manicheans themselves are hostile towards it. According to the Manavi text, they believe that if we accept Urmazd and Ahriman to be emerged from one entity and as the Zorvanists think a demon taught Urmazd to run the world, that is to say that good and evil are intermingled and neither part is absolute good or evil, nor conscious or unconscious and this necessitates nothingness since the law of causality no longer is applicable. The priest continues his reproach and tells Mani that if Ahriman is a twin of Urmazd, then one can regard night, a symbol of Ahriman as day, a symbol of day therefore one cannot distinguish between truthfulness and untruthfulness. The priest’s account about Mani’s beliefs and his criticism is the same criticism that followers of Mani tell about Zorvanism.