What does the Bible say about God's justice and punishment of sin?

The Bible is clear that God’s justice demands the punishment of sin. Romans 3 states that no one is righteous, and all have sinned, thus deserving eternal death. God must act justly, which means that every act of sin incurs a consequence. He executes this judgment against sin in various ways, ultimately culminating in the death of Christ, where the just punishment for the sins of His elect was fulfilled. In Christ's death, God's justice is perfectly upheld, illustrating that He does not clear the guilty but judges sin, providing a way of salvation through imputed righteousness.