Gen 4:15 | KD | STEP | Although Cain expressed not penitence, but fear of punishment, God displayed His long-suffering and gave him the promise, “ Therefore (לכן not in the sense of כן לא, but because it was the case, and there was reason for his complaint) whosoever slayeth Cain, vengeance shall be taken on him sevenfold .” קין כּל־הרג, is cas . absolut . as in ; and הקּם avenged, i.e., resented, punished, as -21. The mark which God put upon Cain is not to be regarded as a mark upon his body, as the Rabbins and others supposed, but as a certain sign which protected him from vengeance, though of what kind it is impossible to determine. God granted him continuance of life, not because banishment from the place of God’s presence was the greatest possible punishment, or because the preservation of the human race required at that time that the lives of individuals should be spared, - for God afterwards destroyed the whole human race, with the exception of one family, - but partly because the tares were to grow with the wheat, and sin develop itself to its utmost extent, partly also because from the very first God determined to take punishment into His own hands, and protect human life from the passion and wilfulness of human vengeance.

‏ Genesis 4:15

Although Cain expressed not penitence, but fear of punishment, God displayed His long-suffering and gave him the promise, “Therefore (לכן not in the sense of כן לא, but because it was the case, and there was reason for his complaint) whosoever slayeth Cain, vengeance shall be taken on him sevenfold.” קין כּל־הרג, is cas. absolut. as in Gen 9:6; and הקּם avenged, i.e., resented, punished, as Exo 21:20-21. The mark which God put upon Cain is not to be regarded as a mark upon his body, as the Rabbins and others supposed, but as a certain sign which protected him from vengeance, though of what kind it is impossible to determine. God granted him continuance of life, not because banishment from the place of God’s presence was the greatest possible punishment, or because the preservation of the human race required at that time that the lives of individuals should be spared, - for God afterwards destroyed the whole human race, with the exception of one family, - but partly because the tares were to grow with the wheat, and sin develop itself to its utmost extent, partly also because from the very first God determined to take punishment into His own hands, and protect human life from the passion and wilfulness of human vengeance.