How do we know Jesus was our substitute for sin?

The doctrine of substitutionary atonement is rooted in the biblical narrative, particularly in passages such as Isaiah 53:6, which affirms that 'the LORD has laid on him the iniquity of us all.' This concept asserts that Christ, who was sinless, took upon Himself the collective guilt of His elect, satisfying divine justice. His atoning work not only fulfills the demands of the law but also demonstrates God's love, as He sent His Son to bear the punishment we rightly deserve. His role as our sin-bearer and mediator illustrates the grandeur of grace in salvation.