Therefore, whosoever slayeth Cain. They who think that it was Cain's wish to perish immediately by one death, in order that he might not be agitated by continual dangers, and that the prolongation of his life was granted him only as a punishment, have no reason, that I can see, for thus speaking. But far more absurd is the manner in which many of the Jews mutilate this sentence. First, they imagine, in this clause, the use of the figure aposiopesis, according to which something not expressed is understood; then they begin a new sentence, He shall be punished sevenfold,' which they refer to Cain. Still, however, they do not agree together about the sense. Some trifle respecting Lamech, as we shall soon declare. Others expound the passage of the deluge, which happened in the seventh generation. But that is frivolous, since the latter was not a private punishment of one family only, but a common punishment of the human race. But this sentence ought to be read continuously, thus, Whosoever killeth Cain, shall on this account, be punished sevenfold.' And the causal particle lkn (lekon,) indicates that God would take care to prevent any one from easily breaking in upon him to destroy him; not because God would institute a privilege in favor of the murderer, or would hearken to his prayers but because he would consult for posterity, in order to the preservation of human life. The order of nature had been awfully violated; what might be expected to happen in future, when the wickedness and audacity of man should increase, unless the fury of others had been restrained by a violent hand? For we know what pestilent and deadly poison Satan presents to us in evil examples, if a remedy be not speedily applied. Therefore, the Lord declares, if any will imitate Cain, not only shall they have no excuse in his example, but shall be more grievously tormented; because they ought, in his person, to perceive how detestable is their wickedness in the sight of God. Wherefore, they are greatly deceived who suppose that the anger of God is mitigated when men can plead custom as an excuse for sinning; whereas it is from that cause the more inflamed. And the Lord set a mark. I have lately said, that nothing was granted to Cain for the sake of favoring him; but for the sake of opposing, in future, cruelty and unjust violence. And therefore, Moses now says, that a mark was set upon Cain, which should strike terror into all; because they might see, as in a mirror, the tremendous judgment of God against bloody men. As Scripture does not describe what kind of mark it was, commentators have conjectured, that his body became tremulous. It may suffice for us, that there was some visible token which should repress in the spectators the desire and the audacity to inflict injury.

The reply of the Lord is suited to quell the troubled breast of Cain. "Therefore." Because thy fears of what thou deservest go beyond what it is my purpose to permit, I give thee assurance of freedom from personal violence. "To be avenged seven-fold" is to be avenged fully. Cain will no doubt receive even-handed justice from the Almighty. The assurance given to Cain is a sign, the nature of which is not further specified.
This passage unfolds to us a mode of dealing with the first murderer which is at first sight somewhat difficult to be understood. But we are to bear in mind that the sentence of death had been already pronounced upon man, and therefore stood over Adam and all his posterity, Cain among the rest. To pronounce the same sentence therefore upon him for a new crime, would have been weak and unmeaning. Besides, the great crime of crimes was disobedience to the divine will; and any particular form of crime added to that was comparatively unimportant. Wrong done to a creature, even of the deepest dye, was not to be compared in point of guilt with wrong done to the Creator. The grave element in the criminality of every social wrong is its practical disregard of the authority of the Most High. Moreover, every other sin to the end of time is but the development of that first act of disobedience to the mandate of heaven by which man fell; and accordingly every penalty is summed up in that death which is the judicial consequence of the first act of rebellion against heaven.
We are also to bear in mind that God still held the sword of justice in his own immediate hands, and had not delegated his authority to any human tribunal. No man was therefore clothed with any right from heaven to call Cain to account for the crime he had committed. To fall upon him with the high hand in a willful act of private revenge, would be taking the law into one's own hands, and therefore a misdemeanor against the majesty of heaven, which the Judge of all could not allow to pass unpunished. It is plain that no man has an inherent right to inflict the sanction of a broken law on the transgressor. This right originally belongs to the Creator, and derivatively only to those whom he has intrusted with the dispensation of civil government according to established laws.
Cain's offences were great and aggravated. But let us not exaggerate them. He was first of all defective in the character of his faith and the form of his sacrifice. His carnal mind came out still more in the wrath and vexation he felt when his defective offering was not accepted. Though the Almighty condescends now to plead with him and warn him against persisting in impenitent silence and discontent, lest he should thereby only become more deeply involved in sin, does not retreat, but, on the contrary, proceeds to slay his brother, in a fit of jealousy; and, lastly, he rudely and falsely denies all knowledge of him, and all obligation to be his protector. Notwithstanding all this, it is still to be remembered that the sentence of death from heaven already hung over him. This was in the merciful order of things comparatively slow of execution in its full extent, but at the same time absolutely certain in the end. The aggravation of the first crime of man by the sins of self-will, sullenness, envy, fratricide, and defiant falsehood, was but the natural fruit of that beginning of disobedience. It is accordingly visited by additional tokens of the divine displeasure, which manifest themselves in this life, and are mercifully calculated to warn Cain still further to repent.
Cain's guilt seems now to have been brought home in some measure to his conscience; and he not only stands aghast at the sentence of banishment from the divine presence, but instinctively trembles, lest, upon the principle of retributive justice, whoever meets him may smite him to the death, as he had done his brother. The longsuffering of God, however, interferes to prevent such a catastrophe, and even takes steps to relieve the trembling culprit from the apprehension of a violent death. This leads us to understand that God, having formed a purpose of mercy toward the human family, was sedulously bent upon exercising it even toward the murderer of a brother. Hence, he does not punish his repeated crimes by "immediate death," which would have defeated his design of giving him a long day of grace and opportunity to reflect, repent, return to God, and even yet offer in faith a typical atonement by blood for his sin. Thus, the prohibition to slay him is sanctioned by a seven-fold, that is, an ample and complete vengeance, and a sign of protection mercifully vouchsafed to him. The whole dealing of the Almighty was calculated to have a softening, conscience-awakening, and hope-inspiring effect on the murderer's heart.

The Lord set a mark upon Cain - What this mark was, has given rise to a number of frivolously curious conjectures. Dr. Shuckford collects the most remarkable. Some say he was paralytic; this seems to have arisen from the version of the Septuagint, Στενων και τρεμων εση, Groaning and trembling shalt thou be. The Targum of Jonathan ben Uzziel says the sign was from the great and precious name, probably one of the letters of the word Yehovah. The author of an Arabic Catena in the Bodleian Library says, "A sword could not pierce him; fire could not burn him; water could not drown him; the air could not blast him; nor could thunder or lightning strike him." The author of Bereshith Rabba, a comment on Genesis, says the mark was a circle of the sun rising upon him. Abravanel says the sign was Abel's dog, which constantly accompanied him. Some of the doctors in the Talmud say that it was the letter ת tau marked on his forehead, which signified his contrition, as it is the first letter in the word תשובה teshubah, repentance. Rabbi Joseph, wiser than all the rest, says it was a long horn growing out of his forehead!
Dr. Shuckford farther observes that the Hebrew word אית oth, which we translate a mark, signifies a sign or token. Thus, Genesis 9:13, the bow was to be לאית leoth, for a sign or token that the world should not be destroyed; therefore the words, And the Lord set a mark upon Cain, should be translated, And the Lord appointed to Cain a token or sign, to convince him that no person should be permitted to slay him. To have marked him would have been the most likely way to have brought all the evils he dreaded upon him; therefore the Lord gave him some miraculous sign or token that he should not be slain, to the end that he should not despair, but, having time to repent, might return to a gracious God and find mercy. Notwithstanding the allusion which I suppose St. Paul to have made to the punishment of Cain, some think that he did repent and find mercy. I can only say this was possible. Most people who read this account wonder why Cain should dread being killed, when it does not appear to them that there were any inhabitants on the earth at that time besides himself and his parents. To correct this mistake, let it be observed that the death of Abel took place in the one hundred and twenty-eighth or one hundred and twenty-ninth year of the world. Now, "supposing Adam and Eve to have had no other sons than Cain and Abel in the year of the world one hundred and twenty-eight, yet as they had daughters married to these sons, their descendants would make a considerable figure on the earth. Supposing them to have been married in the nineteenth year of the world, they might easily have had each eight children, some males and some females, in the twenty-fifth year. In the fiftieth year there might proceed from them in a direct line sixty-four persons; in the seventy-fourth year there would be five hundred and twelve; in the ninety-eighth year, four thousand and ninety-six; in the one hundred and twenty-second they would amount to thirty-two thousand seven hundred and sixty-eight: if to these we add the other children descended from Cain and Abel, their children, and their children's children, we shall have, in the aforesaid one hundred and twenty-eight years four hundred and twenty-one thousand one hundred and sixty-four men capable of generation, without reckoning the women either old or young, or such as are under the age of seventeen." See Dodd.
But this calculation may be disputed, because there is no evidence that the antediluvian patriarchs began to have children before they were sixty-five years of age. Now, supposing that Adam at one hundred and thirty years of age had one hundred and thirty children, which is quite possible, and each of these a child at sixty-five years of age, and one in each successive year, the whole, in the one hundred and thirtieth year of the world, would amount to one thousand two hundred and nineteen persons; a number sufficient to found several villages, and to excite the apprehensions under which Cain appeared at this time to labor.

And the LORD said unto him, Therefore whosoever slayeth Cain, (n) vengeance shall be taken on him sevenfold. And the LORD set a (o) mark upon Cain, lest any finding him should kill him.
(n) Not for the love he had for Cain, but to suppress murder.
(o) Which was some visible sign of God's judgment, that others should fear by it.

And the Lord said unto him,.... In order to satisfy him, and make him easy in this respect, that: he need not fear an immediate or bodily death, which was showing him great clemency and lenity; or in answer to his begging for death, "therefore", or as some render the word, taking them for two, "not so" (y); it shall not be that whoever finds thee shall slay thee, thou needest not be afraid of that; nor shall thy request be granted, that thou mightest be slain by the first man that meets thee: it was the will of God, that though Cain deserved to die, yet that he should not die immediately, but live a long miserable life, that it might be a terror to others not to commit the like crime; though rather the particle should be rendered "verily, surely, of a truth" (z); so it will certainly be, it may be depended on:
whosoever slayeth Cain, vengeance shall be taken on him sevenfold; seven times more than on Cain; that is, he shall be exceedingly punished; vengeance shall be taken on him in a very visible manner, to a very great degree; the Targums of Onkelos and Jonathan are"unto or through seven generations;''the meaning of which is, that the slayer of Cain should not only be punished in his own person, but in his posterity, even unto seven generations; and not as Jarchi and Aben Ezra interpret it, that God deferred his vengeance on Cain unto seven generations, and at the end of them took vengeance on him by Lamech, one of his own posterity, by whom he is supposed by that Jewish writer to be slain:
and the Lord set a mark upon Cain; about which there is a variety of sentiments (a): some say it was a horn in his forehead: others, a leprosy in his face; others, a wild ghastly look; others, a shaking and trembling in all his limbs; and others, that there was an earthquake wherever he stepped: and others will have it, that the dog which guarded Abel's flock was given him to accompany him in his travels, by which sign it might be known that he was not to be attacked, or to direct him from taking any dangerous road: some say it was a letter imprinted on his forehead, either taken out of the great and glorious name of God, as the Targum of Jonathan, or out of his own name, as Jarchi; others the mark or sign of the covenant of circumcision (b): but as the word is often used for a sign or miracle, perhaps the better rendering and sense of the words may be, "and the Lord put", or "gave a sign" (c); that is, he wrought a miracle before him to assure him, that "whoever found him should not kill him": so that this was not a mark or sign to others, to direct or point out to them that they should not kill him, or to deter them from it; but was a sign or miracle confirming him in this, that no one should kill him; agreeably to which is the note of Aben Ezra,"it is right in my eyes that God made a sign (or wrought a miracle) for him, until he believed;''by which he was assured that his life would be secure, go where he would; even that no one should "strike" (d) him, as the word is, much less kill him.
(y) "quasi" , Sept. "nequaquam ita fiet", V. L. (z) "In veritate, certe", Vatablus; "profecto, utique", De Dieu. (a) See Bayle's General Diet. art. "Cain". (b) Tikkune Zohar, correct. 69. fol. 115. 1. & 117. 1. 2. (c) , "sed et posuit Kaino miraculum (in confirmationem) quod non caesurus esset ipsum quisque", &c, Schmidt. (d) , "ne percuteret eum", Pagninus; "ad non percutiendum eum", Montanus.

whosoever slayeth Cain--By a special act of divine forbearance, the life of Cain was to be spared in the then small state of the human race.
set a mark--not any visible mark or brand on his forehead, but some sign or token of assurance that his life would be preserved. This sign is thought by the best writers to have been a wild ferocity of aspect that rendered him an object of universal horror and avoidance.

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 Genesis 9:6; and הקּם avenged, i.e., resented, punished, as Exodus 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.

Whosoever slayeth Cain vengeance shall be taken on him seven - fold - God having said in Cain's case Vengeance is mine, I will repay; it had been a daring usurpation for any man to take the sword out of God's hand. And the Lord set a mark upon Cain - To distinguish him from the rest of mankind. What the mark was, God has not told us: therefore the conjectures of men are vain.