The “ Islamic State of Iraq and Sham” , the ISIS for short, in a military operation, in order to dominate the Neinava Province and a region the center of which is the city of Sinjar on the northwestern coast of the country of Iraq, has committed crimes such as wholesale killing, enslaving the people, and the destruction of sacred places, against the denizens who are recognized as Yezidis. The ISIS has also obligated the Yizidis to convert to Islam and has displaced them into the mountains in an extreme condition of the summer heats of 2014. This being reflected in the universal media, has proposed the accomplishment of genocide as an international crime. This problem in the present study has been investigated through the adaption of the subject features (the victimized, the committed crimes, and the recognition of the criminal's thought situation) with the conditions of crime check in the prevention and punishment of genocide convention. The characteristic under study is that the ISIS not only helps denying the crimes, but also justifies them according to the Islamic doctrines and specifically the Holy Quran as the primary source of Ijtihad in the religion. This claim although appears correct on the face of it, however through scrutiny and authorized interpretations of the Holy Quran their fallacy is exposed. Therefore, their crimes analyzed through the convention is not coordinate with their being in the wrong, and, in any way, their claim is not legal to be surveyed in their crime justification.