How do we know Christ is our substitute for sin?

The concept of Christ as our sinner substitute is fundamental to Reformed theology, which holds that He bore the sins of His elect on the cross. In Mark 14:55, despite false accusations, Jesus remained silent, fulfilling the role of a substitute for sin. As described in 1 Peter 2:24, 'He bore our sins in His body on the tree,' signifying that He took upon Himself the guilt of our transgressions. This perfect obedience and sacrifice not only allows for the atonement of sin but ensures that His righteousness is imputed to believers, forever securing their standing before God.