The Bible recognizes the state's authority to execute justice in specific cases of capital crimes, grounding this in the divine mandate for life-for-life retribution. Historically, the Reformed tradition acknowledges the validity of the civil magistrate to wield the sword for punishment, while emphasizing that all such earthly justice points toward our ultimate need for the righteousness of Christ.
The Scriptures establish the principle of lex talionis (the law of retaliation) to govern civil justice. In the judicial laws given to Israel, specific crimes such as murder required capital punishment, reflecting the gravity of taking a life made in the image of God. As noted in Exodus 21:23-24, the standard for harm was "life for life, eye for eye, tooth for tooth." This ordinance was not intended to incite personal vengeance, but to ensure that the punishment was proportionate and governed by the established authority of the judges.
Augustine, in The City of God Chapter 21, observes that God provided exceptions to the commandment "Thou shalt not kill" through the institution of civil government. When a magistrate acts in obedience to a just law, they act as a "sword in the hand of him who uses it," thereby fulfilling a public duty rather than committing individual murder. This distinction is vital: the state is tasked with restraining evil to protect the common good, while we are called to love our neighbors and refrain from personal malice, as taught in the Small Catechism Question 5.
While earthly justice is necessary to prevent the pollution of the land, as stated in Numbers 35:33, we must remember that we are all sinners before a holy God. We deserve judgment for our transgressions of His law. However, the gospel tells us that Christ, the perfectly righteous One, was put to death in our place. He endured the ultimate penalty so that we who were dead in our sins might be made alive. We are more flawed than we dared believe, yet because of the finished work of Jesus, we are more loved than we ever dared hope.