Whosoever transgresseth, and abideth not in the doctrine of Christ, hath not God - In the doctrine which Christ taught, or the true doctrine respecting him. The language is somewhat ambiguous, like the phrase "the love of Christ," which may mean either his love to us, or our love to him. Compare John 15:9. It is difficult to determine here which is the true sense - whether it means the doctrine or precepts which he taught, or the true doctrine respecting him. Macknight understands by it the doctrine taught by Christ and his apostles. It would seem most probable that this is the sense of the passage, but then it would include, of course, all that Christ taught respecting himself, as well as his other instructions. The essential idea is, that the truth must be held respecting the precepts, the character, and the work of the Saviour. Probably the immediate allusion here is to those to whom John so frequently referred as "antichrist," who denied that Jesus had come in the flesh, 2-John 1:7. At the same time, however, he makes the remark general, that if anyone did not hold the true doctrine respecting the Saviour, he had no real knowledge of God. See John 1:18; John 5:23; John 15:23; John 17:3; 1-John 2:23.
Hath not God - Has no true knowledge of God. The truth taught here is, that it is essential for piety to hold the true doctrine respecting Christ.
He that abideth in the doctrine of Christ - In the true doctrine respecting Christ, or in the doctrine which he taught.
He hath both the Father and the Son - There is such an intimate union between the Father and the Son, that he who has just views of the one has also of the other. Compare the John 14:7, John 14:9-11 notes; 1-John 2:23 note.

Whosoever transgresseth - Παραβαινων· He who passes over the sacred enclosure, or goes beyond the prescribed limits; and abideth not in the doctrine - does not remain within these holy limits, but indulges himself either in excesses of action or passion; hath not God for his Father, nor the love of God in his heart.
Hath both the father and the Son - He who abideth in the doctrine of Christ, his body is a temple of the Holy Trinity, and he has communion with the Father as his Father, and with the Son as his Savior and Redeemer.

Whosoever transgresseth,.... Not the law of God, of which everyone is a transgressors and that daily, in thought, word, or deed; but who passes over the rule and standard of doctrine, the word of God, and will not adhere to that, nor walk according to it, but rejects and despises that rule:
and abideth not in the doctrine of Christ; which he received from his Father, and delivered to his apostles, and of which he is the sum and substance; the doctrine which is concerning his person as the Son of God, and as truly God, and the union of the two natures, divine and human, in his one person; and concerning his office, as the Mediator, surety, and messenger of the covenant, and as the prophet, priest, and King of his church; and concerning his incarnation, obedience, sufferings, death, resurrection from the dead, ascension to heaven, session at God's right hand, intercession for his people, and second coming to judgment; concerning peace and pardon by his blood, atonement by his sacrifice, justification by his righteousness, and complete salvation by him: this is , "the doctrine of the King Messiah", or the Messiah's Talmud (h), to use the Jewish phrase, and which agrees with John's. Now, whoever has embraced and professed this doctrine, but errs concerning it, and rejects it, and abides not in it, as Satan abode not in the truth, appears to be of him:
hath not God; for his Father, but the devil, the father of lies; he has no true knowledge of God, for there is none but in Christ, whose doctrine such an one has denied; nor has he, nor can he, have communion with him, nor any interest in him.
He that abideth in the doctrine of Christ; as he hath received and professed it; neither can anything remove him from it, not the arguments of false teachers, nor the reproaches and persecutions of men, or the snares and allurements of the world:
he hath both the Father and the Son; he has an interest in them both, and has knowledge of each of them, and fellowship with them. The Alexandrian copy and the Vulgate Latin version leave out the phrase, "of Christ", in the preceding clause, and only read, "in the doctrine"; and the Syriac version, "in his doctrine"; the sense is the same.
(h) Bereshit Rabba, sect. 98. fol. 85. 3.

The loss (2-John 1:8) meant is here explained: the not having God, which results from abiding not in the doctrine of Christ.
transgresseth--The oldest manuscripts and versions read, "Every one who takes the lead"; literally, "goes," or "leads on before"; compare John 10:4, "He goeth before them" (not the same Greek). Compare 3-John 1:9, "Loveth to have the pre-eminence."
hath not God-- (1-John 2:23; 1-John 5:15). The second "of Christ" is omitted in the oldest manuscripts, but is understood in the sense.
He--emphatical: He and He alone.

Receive this as a certain rule: Whosoever transgresseth - Any law of God. Hath not God - For his Father and his God. He that abideth in the doctrine of Christ - Believing and obeying it. He hath both the Father and the Son - For his God.