What does the sacrifice of animals signify in the Bible?

In the Old Testament, sacrifices served as a means to atone for sins and illustrate God's holiness. The animals offered, such as those commanded in Genesis 15, symbolize the cost of sin and the need for a substitute to bear the guilt and punishment that humanity deserves. These sacrifices foreshadow Christ's ultimate sacrifice, fulfilling the requirements of the law and providing a permanent solution for sin. The sacrificial system underscores God's justice, as He does not overlook sin but addresses it through payment, providing a pathway for reconciliation with Him.