1 John 4:2

“Hereby know ye the Spirit of God, &c.] This is a rule by which believers may know whether a man professing to have the Spirit of God, and to be called and sent by him, and whether the, doctrine he preaches, is of him or not: every spirit that confesseth that Jesus Christ is come in the flesh, is of God; or of the Spirit of God; that is, every doctrine which carries this truth in it; or every man that owns, and professes, and publishes this doctrine concerning Christ, is on the side of God and truth; and which contains several articles in it, respecting the person and office of Christ; as that he existed before he came in the flesh, not in the human nature, or as man, or as an angel, but as…”

“Hereby--"Herein." know . . . the Spirit of God--whether he be, or not, in those teachers professing to be moved by Him. Every spirit--that is, Every teacher claiming inspiration by the HOLY SPIRIT. confesseth--The truth is taken for granted as established. Man is required to confess it, that is, in his teaching to profess it openly. Jesus Christ is come in the flesh--a twofold truth confessed, that Jesus is the Christ, and that He is come (the Greek perfect tense implies not a mere past historical fact, as the aorist would, but also the present continuance of the fact and its blessed effects) in the flesh ("clothed with flesh": not with a mere seeming humanity, as the DocetÃ&brvbr afterwards…”

“Hereby - Greek, “By this;” that is, by the test which is immediately specified. Know ye the Spirit of God - You may discern who are actuated by the Spirit of God. Every spirit - Everyone professing to be under the influence of the Spirit of God. The apostle uses the word “spirit” here with reference to the person who made the claim, on the supposition that everyone professing to be a religious teacher was animated by some spirit or foreign influence, good or bad. If the Spirit of God influenced them, they would confess that Jesus Christ had come in the flesh; if some other spirit, the spirit of error and deceit, they would deny this. That confesseth - That is, that makes a proper…”

“Every spirit - Or teacher. Which confesseth - Both with heart and voice. Jesus Christ, who is come in the flesh, is of God - This his coming presupposes, contains, and draws after it, the whole doctrine of Christ. 1 John 4:3”

“4:2 If a person claiming to be a prophet: John outlines a doctrinal test for prophets and teachers. Those who have the Spirit of God confess that Jesus Christ came in a real body. In other words, they must affirm the reality that Jesus is both fully man and fully God. Prophets and teachers who deny these basic teachings are antichrists (2:18). Certain false teachers in John’s day (the Docetists) taught that Jesus Christ only seemed to have a human body but did not really have one. They thereby denied that God became flesh; see 1:1-3; John 1:14).”

“Every: Jo1 5:1; Joh 16:13-15; Co1 12:3 come: Jo1 4:3; Joh 1:14; Ti1 3:16 1 John 4:3”