How do we know Christ's work of substitution is true?

The truth of Christ’s substitutionary work is firmly rooted in the narrative of the Bible. In John 3:14, Jesus compares His future crucifixion to the serpent lifted by Moses, indicating that just as the Israelites looked to the serpent for healing, so must believers look to Him for salvation. This typology illustrates that Christ’s sacrifice fulfills the requirement of justice for our sins. Furthermore, His own proclamation in Matthew 20:28, 'the Son of Man came not to be ministered unto, but to minister, and to give his life a ransom for many,' reinforces His mission as a substitute for His people. Thus, the doctrine of substitution is biblically grounded and vital to understanding salvation.