What does the Bible say about salvation by substitution?

Salvation by substitution is a central theme in both the Old and New Testaments, embodied in the sacrificial system and fulfilled in Jesus Christ. As Jonah was cast into the sea and faced the wrath of the storm, he served as a type of Christ, who took our place in bearing the penalty for our sins. Just as the mariners realized that their peril was due to Jonah, we understand that our separation from God stems from our sin, which Christ bore on the cross. This doctrine emphasizes that salvation is not achieved through our works but through faith in Christ who substituted himself for us, providing reconciliation with God and securing eternal life for His elect.