How do we know Jesus Christ is the true substitute for sin?

The truth of Christ as our substitute is depicted throughout Scripture, particularly in the New Testament. The requirements for the Passover lamb were that it be without blemish, which directly points to Christ's perfection: 'For he made him who knew no sin to be sin for us' (2 Corinthians 5:21). Jesus, being the embodiment of perfection, fulfills this requirement, as 1 Peter 1:19 states, 'You were redeemed with the precious blood of Christ, as of a lamb without blemish and without spot.' His sacrificial death was not arbitrary; it was divinely ordained to satisfy God's justice on behalf of His chosen people, making Him the perfect atoning sacrifice.