The seventh law is unique among the seven: it is a positive commandment — an obligation to do something, not merely to refrain. Every society of Noahides is obligated to establish functioning courts of justice that enforce the other six laws and resolve disputes fairly between people.
This law recognizes a fundamental truth: moral principles, however noble, require institutional support to be realized in the world. Without courts, the prohibitions against murder, theft, and immorality remain ideals rather than lived realities. Justice must be not only declared but enforced.
The courts envisioned by this law are to be impartial — no favoritism toward the rich or the powerful, no prejudice against the poor or the foreigner. The Torah is emphatic: you shall not pervert justice; you shall not show partiality (Deuteronomy 16:19). A society that corrupts its judiciary has corrupted itself at the root.
Jewish tradition sees this law as the social fabric that holds civilization together. A world with the other six laws but no courts is a world without the mechanism to make those laws real. The commitment to justice transforms personal morality into a civilizational order.