God has used Jesus as a covering for our sin. In Leviticus God instructs the Israelites not to drink the blood of an animal that is prepared for food because the life is in the blood. Christs blood is a symbol for us to understand that not only does His blood cover our sin but it also gives us new life. If someone sins against you, can they ever really take that away. They would need to repent to you of thier sin. Through Jesus blood we have repentance of our sin before God.