Whosoever committeth, or doeth, sin. The Apostle has already shown how ungrateful we must be to God, if we make but little account of the honor of adoption, by which he of his own goodwill anticipates us, and if we do not, at least, render him mutual love. He, at the same time, introduced this admonition, that our love ought not to be diminished, because the promised happiness is deferred. But now, as men are wont to indulge themselves more than they ought, in evils, he reproves this perverse indulgence, declaring that all they who sin are wicked and transgressors of the law. For it is probable that there were then those who extenuated their vices by this kind of flattery, "It is no wonder if we sin, because we are men; but there is a great difference between sin and iniquity." This frivolous excuse the Apostle now dissipates, when he defines sin to be a transgression of the divine law; for his object was to produce hatred and horror as to sin. The word sin seems light to some; but iniquity or transgression of the law cannot appear to be so easily forgiven. But the Apostle does not make sins equal, by charging all with iniquity who sin; but he means simply to teach us, that sin arises from a contempt of God, and that by sinning, the law is violated. Hence this doctrine of John has nothing in common with the delirious paradoxes of the Stoics. Besides, to sin here, does not mean to offend in some instances; nor is the word sin to be taken for every fault or wrong a man may commit.; but he calls that sin, when men with their whole heart run into evil, nor does he understand that men sin, except those who are given up to sin. For the faithful, who are as yet tempted by the lusts of the flesh, are not to be deemed guilty of iniquity, though they are not pure or free from sin, but as sin does not reign in them, John says that they do not sin, as I shall presently explain more fully. The import of the passage is, that the perverse life of those who indulge themselves in the liberty of sinning, is hateful to God, and cannot be borne with by him, because it is contrary to his Law. It does not hence follow, nor can it be hence inferred, that the faithful are iniquitous; because they desire to obey God, and abhor their own vices, and that in every instance; and they also form their own life, as much as in them lieth, according to the law. But when there is a deliberate purpose to sin, or a continued course in sin, then the law is transgressed. [1]

Footnotes

1 - To do, or to commit, or to work, or to practice, sin, and to sin, are evidently used in the same sense by the Apostle: and to commit or practice sin, according to what he says in his Gospel, (John 8:34,) is the same with being "the servant of sin." It is hence evident, that in the language of John, to do sin, or to sin, means a prevailing or an habitual course of sinning. We might render the fourth verse thus, -- "Every doer of sin, is also the doer of unrighteousness; for sin is unrighteousness," or iniquity, as Calvin renders it. The word anomia, literally, is lawlessness, but it is never used strictly in this sense either in the Sept or the New Testament. The terms by which it is commonly expressed, are, wickedness, iniquity, transgression, unrighteousness. See verse 7. -- Ed

Whosoever committeth sin transgresseth also the law - The law of God given to man as a rule of life. The object of the apostle here is to excite them to holiness, and to deter them from committing sin, perhaps in view of the fact stated in 1-John 3:3, that everyone who has the hope of heaven will aim to be holy like the Saviour. To confirm this, he shows them that, as a matter of fact, those who are born of God do lead lives of obedience, 1-John 3:5-10; and this he introduces by showing what is the nature of sin, in the verse before us. The considerations by which he would deter them from indulging in sin are the following:
(a) all sin is a violation of the law of God, 1-John 3:4;
(b) the very object of the coming of Christ was to deliver people from sin, 1-John 3:5;
(c) those who are true Christians do not habitually sin, 1-John 3:6;
(d) those who sin cannot be true Christians, but are of the devil, 1-John 3:8; and,
(e) he who is born of God has a germ or principle of true piety in him, and cannot sin, 1-John 3:9.
It seems evident that the apostle is here combating an opinion which then existed that people might sin, and yet be true Christians, 1-John 3:7; and he apprehended that there was danger that this opinion would become prevalent. On what ground this opinion was held is unknown. Perhaps it was held that all that was necessary to constitute religion was to embrace the doctrines of Christianity, or to be orthodox in the faith; perhaps that it was not expected that people would become holy in this life, and therefore they might indulge in acts of sin; perhaps that Christ came to modify and relax the law, and that the freedoM which he procured for them was freedom to indulge in whatever people chose; perhaps that, since Christians were heirs of all things, they had a right to enjoy all things; perhaps that the passions of people were so strong that they could not be restrained, and that therefore it was not wrong to give indulgence to the propensities with which our Creator has formed us. All these opinions have been held under various forms of Antinomianism, and it is not at all improbable that some or all of them prevailed in the time of John. The argument which he urges would be applicable to any of them. The consideration which he here states is, that all sin is a transgression of law, and that he who commits it, under whatever pretence, is to be held as a transgressor of the law. The literal rendering of this passage is, "He who doeth sin (ἁμαρτίαν hamartian ) doeth also transgression" - ἀνομίαν anomian. Sin is the generic term embracing all that would be wrong. The word transgression (ἀνομία anomia) is a specific term, showing where the wrong lay, to wit, in violating the law.
For sin is the transgression of the law - That is, all sin involves this as a consequence that it is a violation of the law. The object of the apostle is not so much to define sin, as to deter from its commission by stating what is its essential nature - though he has in fact given the best definition of it that could be given. The essential idea is, that God has given a law to people to regulate their conduct, and that whatever is a departure from that law in any way is held to be sin. The law measures our duty, and measures therefore the degree of guilt when it is not obeyed. The law determines what is right in all cases, and, of course, what is wrong when it is not complied with. The law is the expression of what is the will of God as to what we shall do; and when that is not done, there is sin. The law determines what we shall love or not love; when our passions and appetites shall be bounded and restrained, and to what extent they may be indulged; what shall be our motives and aims in living; how we shall act toward God and toward people; and whenever, in any of these respects, its requirements are not complied with, there is sin.
This will include everything in relation to which the law is given, and will embrace what we "omit" to do when the law has commanded a thing to be done, as well as a "positive" act of transgression where the law has forbidden a thing. This idea is properly found in the original word rendered "transgression of the law" - ἀνομία anomia. This word occurs in the New Testament only in the following places: Matthew 7:23; Matthew 13:41; Matthew 23:28; Matthew 24:12; Romans 4:7; Romans 6:19; 2-Thessalonians 2:7; Titus 2:14; Hebrews 1:9; Hebrews 8:12; Hebrews 10:17, in all which places it is rendered "iniquity" and "iniquities;" in 2-Corinthians 6:14, where it is rendered "unrighteousness;" and in the verse before us twice. It properly means lawlessness, in the sense that the requirements of the law are not conformed to, or complied with; that is, either by not obeying it, or by positively violating it. When a parent commands a child to do a thing, and he does not do it, he is as really guilty of violating the law as when he does a thing which is positively forbidden. This important verse, therefore, may be considered in two aspects - as a definition of the nature of sin, and as an argument against indulgence in it, or against committing it.
I. As a definition of the nature of sin. It teaches.
(a) that there is a rule of law by which the conduct of mankind is to be regulated and governed, and to which it is to be conformed.
(b) That there is sin in all cases where that law is not complied with; and that all who do not comply with it are guilty before God.
(c) That the particular thing which determines the guilt of sin, and which measures it, is that it is a departure from law, and consequently that there is no sin where there is no departure from law.
The essential thing is, that the law has not been respected and obeyed, and sin derives its character and aggravation from that fact. No one can reasonably doubt as to the accuracy of this definition of sin. It is founded on the fact:
(a) that God has an absolute right to prescribe what we may and may not do;
(b) that it is to be presumed that what he prescribes will be in accordance with what is right; and,
(c) that nothing else in fact constitutes sin. Sin can consist in nothing else. It does not consist of a particular height of stature, or a particular complexion; of a feeble intellect, or an intellect made feeble, as the result of any former apostasy; of any constitutional propensity, or any disposition founded in our nature as creatures.
For none of these things do our consciences condemn us; and however we may lament them, we have no consciousness of wrong.
(In these remarks the author has in view the doctrine of original sin, or imputed sin, which he thinks as absurd as sin of stature or complexion. His views will be found at large in the notes at Romans. 5 throughout, and by comparing these with the supplementary notes on the same place, the reader will be able to form his own opinion. There does not seem to be anything affecting the point in this passage.)
II. As an argument against the commission of sin. This argument may be considered as consisting of two things - the wrong that is done by the violation of law, and the exposure to the penalty.
(1) the wrong itself. This wrong, as an argument to deter from sin, arises mainly from two things:
(a) because sin is a violation of the will of God, and it is in itself wrong to disregard that will; and,
(b) because it is to be presumed that when God has given law there is a good reason why he has done it.
(2) the fact that the law has a penalty is an argument for not violating the law.
All law has a penalty; that is, there is some suffering, disadvantage, forfeit of privileges, etc., which the violation of law draws in its train, and which is to be regarded as an expression of the sense which the lawgiver entertains of the value of his law, and of the evil of disobeying it. Many of these penalties of the violation of the divine law are seen in this life, and all will be certain to occur sooner or later, in this world or in the world to come. With such views of the law and of sin - of his obligations, and of the evils of disobedience - a Christian should not, and will not, deliberately and habitually violate the law of God.

Sin is the transgression of the law - The spirit of the law as well as of the Gospel is, that "we should love God with all our powers, and our neighbor as ourselves." All disobedience is contrary to love; therefore sin is the transgression of the law, whether the act refers immediately to God or to our neighbor.

(5) Whosoever (f) committeth sin transgresseth also the law: for (g) sin is the transgression of the law.
(5) The rule of this purity can from no where else be taken but from the law of God, the transgression of which is called sin.
(f) Does not give himself to pureness.
(g) A short definition of sin.

Whosoever committeth sin,.... This, in connection with what follows, is true of any sin, great or small, but here designs a course of sinning, a wilful, obstinate, persisting in sin:
transgresseth also the law; not of man, unless the law of men is founded on, and agrees with the law of God, for sometimes to transgress the laws of men is no sin, and to obey them would be criminal; but the law of God, and that not the ceremonial law, which was now abolished, and therefore to neglect it, or go contrary to it, was not sinful; but the moral law, and every precept of it, which regards love to God or to our neighbour, and which may be transgressed in thought, word, and deed; and he that committeth sin transgresses it in one or all of these ways, of which the law accuses and convicts, and for it pronounces guilty before God, and curses and condemns; and this therefore is an argument against sinning, because it is against the law of God, which is holy, just, and good, and contains the good and acceptable, and perfect will of God, which is agreeable to his nature and perfections; so that sin is ultimately against God himself:
for sin is a transgression of the law; and whatever is a transgression of the law is sin; the law requires a conformity of nature and actions to it, and where there is a want of either, it is a breach of it; it is concerned with the will and affections, the inclinations and desires of the mind, as well as the outward actions of life; concupiscence or lust is a violation of the law, as well as actual sin; and especially a course of sinning both in heart, lip, and life, is a continued transgression of it, and exposes to its curse and condemnation, and to the wrath of God; and is inconsistent with a true hope of being the sons and heirs of God: but then the transgression of what is not the law of God, whether the traditions of the elders among the Jews, or the ordinances of men among Papists, Pagans, and Turks, or any other, is no sin, nor should affect the consciences of men.

Sin is incompatible with birth from God (1-John 3:1-3). John often sets forth the same truth negatively, which he had before set forth positively. He had shown, birth from God involves self-purification; he now shows where sin, that is, the want of self-purification, is, there is no birth from God.
Whosoever--Greek, "Every one who."
committeth sin--in contrast to 1-John 3:3, "Every man that hath this hope in Him purifieth himself"; and 1-John 3:7, "He that doeth righteousness."
transgresseth . . . the law--Greek, "committeth transgression of law." God's law of purity; and so shows he has no such hope of being hereafter pure as God is pure, and, therefore, that he is not born of God.
for--Greek, "and."
sin is . . . transgression of . . . law--definition of sin in general. The Greek having the article to both, implies that they are convertible terms. The Greek "sin" (hamartia) is literally, "a missing of the mark." God's will being that mark to be ever aimed at. "By the law is the knowledge of sin." The crookedness of a line is shown by being brought into juxtaposition with a straight ruler.

Whosoever committeth sin, etc. The very act of sinning is a breaking of law. "Sin is lawlessness" (Revision).
Was manifested to take away our sins. Christ came, not only to take away our sins by their remission, but to take away our disposition to sin.
Whosoever abideth in him sinneth not. One ceaseth to abide in him when he engages in sinning. See note at the end of the Epistle.
Hath not seen him, etc. "Whosoever sinneth," that is, sins habitually, thereby shows that he hath not experimental insight and knowledge of Christ. There is no fellowship with the Sinless One.
Let no man deceive you. Do not be deluded into the belief that any one can be righteous unless he practices righteousness.
He that committeth sin is of the devil. A sinful life is a proof of the devil's power. Christ came to destroy the works of the devil, and it is his work to destroy sin in all his disciples.
Whosoever is born of God doth not commit sin. The thought is that he does not live a life of sin. The spirit born of God, the new creation, does not sin, and cannot sin and remain God's child, but sometimes the old nature revives and for a moment exerts its power. "It is no more I that do it but sin that dwelleth in me" (Romans 7:20). See note at end of the Epistle.
His seed remaineth in him. The principle of divine life, and hence he cannot live a sinful life. "That which is born of the Spirit is spirit." This new nature cannot sin. If we sin, it is the old nature revived. Unless at once we repent and flee to him he will depart from us.
In this, etc. Thus is the distinction clear between God's children and those of the devil. God's children are full of love and live holy lives. Those of the devil are the opposite.

Whosoever committeth sin - Thereby transgresseth the holy, just, and good law of God, and so sets his authority at nought; for this is implied in the very nature of sin.