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.

In this chapter we have both the world and the church in a family, in a little family, in Adam's family, and a specimen given of the character and state of both in after-ages, nay, in all ages, to the end of time. As all mankind were represented in Adam, so that great distinction of mankind into saints and sinners, godly and wicked, the children of God and the children of the wicked one, was here represented in Cain and Abel, and an early instance is given of the enmity which was lately put between the seed of the woman and the seed of the serpent. We have here, I. The birth, names, and callings, of Cain and Abel (Gen 4:1, Gen 4:2). II. Their religion, and different success in it (Gen 4:3, Gen 4:4 and part of Gen 4:5). III. Cain's anger at God and the reproof of him for that anger (Gen 4:5-7). IV. Cain's murder of his brother, and the process against him for that murder. The murder committed (Gen 4:8). The proceedings against him. 1. His arraignment (Gen 4:9, former part). 2. His plea (Gen 4:9, latter part). 3. His conviction (Gen 4:10). 4. The sentence passed upon him (Gen 4:11, Gen 4:12). 5. His complaint against the sentence (Gen 4:13, Gen 4:14). 6. The ratification of the sentence (Gen 4:15). 7. The execution of the sentence (Gen 4:15, Gen 4:16). V. The family and posterity of Cain (Gen 4:17-24). VI. The birth of another son and grandson of Adam (Gen 4:25, Gen 4:26).

4:15 Sevenfold punishment was the full weight of justice. Cain complained that his punishment was too great, but the full sentence that would fall on anyone who committed Cain’s crime against him shows how gracious the Lord was to Cain. Cain deserved death (see 9:5-6). • The mark graciously provided protection following Cain’s judgment (cp. 3:21).