One type of sacrifice involves the offering of blood or life. According to one theory, the practice of blood sacrifice was based on the belief that life is precious, and therefore valuable to the gods. When freed from an earthly body, it was believed, life returned to its sacred source. In ancient Rome, a person performing a sacrifice said to the god, “Be thou increased by this offering.” The idea behind this type of sacrifice was not pain, suffering, or death. Rather, life was being returned to the divine world so that the gods, in turn, would continue to give life to the human world.
Other theories provide different explanations for blood sacrifice. One suggests that it began as a form of magic. Another says that sacrifice may have been viewed as a symbolic meal that the community shared with its deity, or as a reenactment of creation myths. Still another theory claims that sacrifice may have been seen as a way of focusing and controlling aggression within the community.
Hunting peoples generally sacrificed game animals, while herding and farming peoples used domestic animals, such as sheep, goats, chickens, and cattle. Certain types of animals were regarded as the most appropriate sacrifices for particular purposes or for particular deities. Dark-colored animals, for example, might be offered to deities of the underworld (land of the dead), while an all-white animal might be seen as the best gift for a sky god.
The sacrifice of humans has occurred in many parts of the world. There is also evidence that in some communities animals were eventually substituted for human victims. The method of slaughter generally involved either blood (flowing freely or offered in a ceremonial vessel), fire (to carry the sacrifice to the god), or both. Sometimes, however, the person to be sacrificed was strangled, hanged, or drowned.
A special person, such as a ruler, priest, head of household, or older member of the community, usually supervised or carried out the sacrifice. The sacrifice was made in front of a group—it was too important an act to be performed privately. Special rituals, such as ceremonial bathing or fasting, often accompanied the sacrifice. The sacrificial offering might be placed on an altar or before a statue of a deity or burned in a sacred fire so that the smoke would carry its scent to the heavens.