How do we know that God will punish sin?

The assurance of God's punishment of sin is vividly illustrated through the cross of Christ. As stated in Romans 6:23, 'the wages of sin is death', highlighting the seriousness of sin's consequences. The ultimate demonstration is found in the suffering of Jesus, who bore our sins on the cross, as stated in Isaiah 53:5, where He was 'wounded for our transgressions.' If God did not spare His own Son but laid our iniquities upon Him, it underscores His justice in punishing sin. This reality calls us to recognize the weight of sin and the necessity of repentance and faith in Christ for salvation.