Is a murderer To stimulate us still more to love, he shews how detestable before God is hatred. There is no one who dreads not a murderer; nay, we all execrate the very name. But the Apostle declares that all who hate their brethren are murderers. He could have said nothing more atrocious; nor is what is said hyperbolical, for we wish him to perish whom we hate. It does not matter if a man keeps his hands from mischief; for the very desire to do harm, as well as the attempt, is condemned before God: nay, when we do not ourselves seek to do an injury, yet if we wish an evil to happen to our brother from some one else, we are murderers. Then the Apostle defines the thing simply as it is, when he ascribes murder to hatred. Hence is proved the folly of men, that though they abominate the name, they yet make no account of the crime itself. Whence is this? even because the external face of things engrosses our thoughts; but the inward feeling comes to an account before God. Let no one therefore extenuate any more so grievous an evil. Let us learn to refer our judgments to the tribunal of God.

Whosoever hateth his brother is a murderer - That is, he has the spirit of a murderer; he has that which, if it were acted out, would lead him to commit murder, as it did Cain. The private malice, the secret grudge, the envy which is cherished in the heart, is murderous in its tendency, and were it not for the outward restraints of human laws, and the dread of punishment, it would often lead to the act of murder. The apostle does not say that he who hates his brother, though he does not in fact commit murder, is guilty to the same degree as if he had actually done it; but he evidently means to say that the spirit which would lead to murder is there, and that God will hold him responsible for it. Nothing is missing but the removal of outward restraints to lead to the commission of the open deed, and God judges people as he sees them to be "in their hearts." What a fearful declaration, then, is this! How many real murderers there are on the earth besides those who are detected and punished, and besides those open violators of the laws of God and man who go at large! And who is them that should not feel humbled and penitent in view of his own heart, and grateful for that sovereign mercy which has restrained him from open acts of guilt - for who is there who has not at some period of his life, and perhaps often, indulged in feelings of hatred, and envy, and malice toward others, which, if acted out, would have led to the commission of the awful crime of taking human life? Any man may well shudder at the remembrance of the secret sins of his own heart, and at the thought of what he would have been but for the restraining grace of God. And how wonderful is that grace which, in the case of the true Christian, not only restrains and checks, but which effectually subdues all these feelings, and implants in their place the principles of love!

Whosoever hateth his brother is a murderer - He has the same principle in him which was in Cain, and it may lead to the same consequences.
No murderer hath eternal life - Eternal life springs from an indwelling God; and God cannot dwell in the heart where hatred and malice dwell. This text has been quoted to prove that no murderer can be saved. This is not said in the text; and there have been many instances of persons who have been guilty of murder having had deep and genuine repentance, and who doubtless found mercy from his hands who prayed for his murderers, Father, forgive them; for they know not what they do! It is, however, an awful text for the consideration of those who shed human blood on frivolous pretences, or in those wars which have their origin in the worst passions of the human heart.

(15) Whosoever hateth his brother is a murderer: and ye know that no murderer hath eternal life abiding in him.
(15) A confirmation: Whoever is a murderer, is in eternal death: he who hates his brother is a murderer, therefore he is in death. Thereupon follows the other side: He that loves his brother has passed to life, for indeed we are born dead.

Whosoever hateth his brother is a murderer,.... A soul murderer, as the Ethiopic version renders it; not only of himself, for every sinner, by sinning, wrongs and destroys his own soul; but of his brother whom he hates: he is a murderer of him in his heart, even as he that lusts after a woman hath committed adultery with her in his heart, out of which arise murders, as well as adulteries; it is not only taking away life, but also causeless anger, malice, and hatred, that is a breach of the sixth command; see Matthew 5:21;
and ye know that no murderer hath eternal life abiding in him; he has not the grace of life, or the beginning of eternal life in him; he has no meetness for it, being unregenerate; and no right unto it, being unrighteous; nor has he the earnest and pledge of it, being destitute of the Spirit of God; all which a regenerate man has, and has them abiding in him: not but that the sin of murder may be forgiven; a man guilty of it may truly repent, and have pardoning grace applied unto him, and enjoy eternal life, through the grace of the Spirit, and the blood and righteousness of Christ; but without these he is so far from having eternal life, that he is not only punishable with a corporeal death, according to the laws of God and man; but he is exposed unto, and will die the second, or an eternal death.

hateth--equivalent to "loveth not" (1-John 3:14); there is no medium between the two. "Love and hatred, like light and darkness, life and death, necessarily replace, as well as necessarily exclude, one another" [ALFORD].
is a murderer--because indulging in that passion, which, if followed out to its natural consequences, would make him one. "Whereas, 1-John 3:16 desires us to lay down our lives for the brethren; duels require one (awful to say!) to risk his own life, rather than not deprive another of life" [BENGEL]. God regards the inward disposition as tantamount to the outward act which would flow from it. Whomsoever one hates, one wishes to be dead.
hath--Such a one still "abideth in death." It is not his future state, but his present, which is referred to. He who hates (that is, loveth not) his brother (1-John 3:14), cannot in this his present state have eternal life abiding in him.

He, I say, abideth in spiritual death, is void of the life of God. For whosoever hateth his brother, and there is no medium between loving and hating him, is, in God's account, a murderer: every degree of hatred being a degree of the same temper which moved Cain to murder his brother. And no murderer hath eternal life abiding in him - But every loving believer hath. For love is the beginning of eternal life. It is the same, in substance, with glory.