Abrahamic religions including Judaism and Islam have many similarities in their belief as well as ritual system. Based on these similarities, the some Orientalists claim that Islam is plagiarised religion from the preceding religion, i.e. Judaism. This paper compares two rituals of Judaism and Islam i.e. prayer and fasting. Based on this extensive comparison, this paper argues that the issue of similarities rather proves the originality of Islam and the continuity of the revelation that brought down from Allah.