What does the Bible say about the significance of blood in the Passover?

In Exodus 12, the blood of the lamb served as a sign for the Israelites, indicating that God's judgment would pass over their homes. This act foreshadowed the ultimate sacrifice of Jesus Christ, who is described as the Lamb slain for the foundation of the world (Revelation 13:8). The significance of blood in the Passover is that it represents a covenant of protection and deliverance for God's chosen people, highlighting the importance of atonement for sin through the shedding of innocent blood.