This essay examines various functions of blood in ancient Israel (e.g. apotropaic function, blood as life, blood as ritual detergent, covenant blood, and blood as God`s beverages) and seeks to identify and explain the rationale for such usages of blood. While blood was not significant in Mesopotamia where the presentation of the offering was the focus of the cult, blood played an important role in ancient Israelite religion. Deuteronomy and the Priestly traditions developed Israel`s unique sacrificial system based on the idea “blood is life” (Gen 9:4; Deut 12:23), and the Holiness Code went even further and ascribed expiatory function to blood (Lev 17:11). The priestly group tried to maintain the system of hierarchy and acquire economic gains by means of blood rituals and various regulations regarding the manipulation and disposal of blood. It is hoped that further studies will investigate the symbolism of blood in Korean churches as well as in the New Testament.