Genesis 9 states there is retribution for shedding human blood, stating that those who take a life should forfeit their own life. Lifelong imprisonment for murderers is counter to this command of God. This principle emphasizes the sanctity of human life that is rooted in the truth that humans are created in the image of God. God's covenant with Noah and his descendants was made and recorded here, giving the rainbow as a sign of God's mercy and grace. This is contrasted with Satan's attempts to deceive through signs in the sky that ultimately serve to deceive and lead humanity away from God. Luther's perspective on colors in the rainbow, highlight their significance in representing God's judgment and mercy.