Why is a sacrifice needed?

When Adam and Eve ate of the fruit from the Tree of the Knowledge of Good and Evil, that moment they died spiritually and began dyeing physically. Spiritual death is being separated from a Righteous God due to one’s sin.

God provided a means where people could restore their relationship with God through sacrifices.

The primary purpose of sacrifices, especially blood sacrifices, was to atone for sin, meaning to make amends or cover for the offense committed against God. 

Throughout the Old Testament, every book, points toward the Great Sacrifice that was to come—that of Jesus’ sacrificial giving of His own life on our behalf.