New Defender's Study Bible Notes
9:6 blood be shed. This establishment of capital punishment, administered judicially by man, has never been changed or withdrawn. It is still God’s law today, and forms the basic authorization of the institution of human government. It implies also the enactment and enforcement of regulations for those human activities (e.g., stealing, adultery) which if unrestrained, would lead to murder. It does not stipulate the form, but only the fact of government. It extends the primeval mandate by giving man the responsibility to control not only the animals but his own society also. The original commission in effect had authorized the natural sciences and technologies; this new extension incorporated in God’s covenant with Noah in effect authorizes the social sciences and their technologies (e.g., psychology, law, sociology, anthropology, political science, government, police, criminology).
Although capital punishment is the proper prerogative of human society (“every man’s brother”) in so far as strict justice is concerned, mitigating circumstances (especially sincere repentance and restitution) may warrant extension of mercy in individual cases. Nevertheless, the basic right of governments to exact capital punishment as penalty for murder cannot legitimately be abrogated as far as God is concerned. This is clear even in the Christian dispensation. The eating of meat (I Timothy 4:3,4), the abstinence from blood (Acts 15:19, 20) and the authority of the governmental sword (Romans 13:4; Acts 25:11) were reaffirmed to the early church, making it clear that the Noahic mandate still applied.