Commentary - Genesis 9:5-6

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John Calvin 

What I have said must be remembered, that this language rather expresses the atrociousness of the crime; because whosoever kills a man, draws down upon himself the blood and life of his brother. On the whole, they are deceived (in my judgment) who think that a political law, for the punishment of homicides, is here simply intended. Truly I do not deny that the punishment which the laws ordain, and which the judges execute, are founded on this divine sentence; but I say the words are more comprehensive. It is written,

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Men of blood shall not live out half their days  Psalm 55:23

 

And we see some die in highways, some in stews, and many in wars. Therefore, however magistrates may connive at the crime, God sends executioners from other quarters, who shall render unto sanguinary men their reward. God so threatens and denounces vengeance against the murderer, that he even arms the magistrate with the sword for the avenging of slaughter, in order that the blood of men may not be shed with impunity...since they bear the image of God engraven on them, He deems himself violated in their person. Thus, although they have nothing of their own by which they obtain the favor of God, he looks upon his own gifts in them, and is thereby excited to love and to care for them. This doctrine, however is to be carefully observed that no one can be injurious to his brother without wounding God himself.   Biblehub.com

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