How do we know Jesus as our substitute?

The identity of Jesus as our substitute is rooted in the Old Testament with figures like Seth, who was a substitute for Abel, representing God's provision for humanity's sin. Jesus fulfills this role perfectly as He is not only the Lamb of God who takes away the sin of the world but also the one who bears God's justice on behalf of His people. As stated in Romans 8:3, God sent His own Son in the likeness of sinful flesh to deal with sin. His death and resurrection ensure that all who believe in Him are counted righteous before God, affirming that Christ's sacrifice is fully sufficient for our salvation.