How do we know that substitution is a true doctrine?

The doctrine of substitution is supported throughout Scripture, but is notably illustrated in Isaiah 53, where the prophecy foretells Christ's suffering and death as the atonement for sin. Additionally, passages such as 2 Corinthians 5:21 declare that God made Christ to be sin for us, emphasizing that in Him, we attain righteousness. The undeniable connections between Old Testament prophecy and New Testament fulfillment provide a robust framework for understanding how substitution operates within biblical theology.