1 John 2:22

“Who is a liar, but he that denieth that Jesus is the Christ? &c.] Or that very Christ, and true Messiah, who was spoken of by all the prophets, since the beginning of the world, and so much, and so long desired by the Old Testament saints: he that denies that Jesus of Nazareth is the Messiah of the prophets, is not indeed the only liar in the world, but he is the greatest of liars; this is a consummate lie, being opposed to a glaring truth, to a fact clear an indisputable; and which rests not merely on the testimony of Jesus, who is truth itself, and who, in express words, more than once, declared and asserted himself to be the Christ; but all the characters of the Messiah, everything that…”

“a liar--Greek, "Who is the liar?" namely, guilty of the lie just mentioned (Jo1 2:21). that Jesus is the Christ--the grand central truth. He is Antichrist--Greek, "the Antichrist"; not however here personal, but in the abstract; the ideal of Antichrist is "he that denieth the Father and the Son." To deny the latter is virtually to deny the former. Again, the truth as to the Son must be held in its integrity; to deny that Jesus is the Christ, or that He is the Son of God, or that He came in the flesh, invalidates the whole (Mat 11:27).”

“Who is a liar - That is, who is false; who maintains an erroneous doctrine; who is an impostor, if he is not? The object of the apostle is to specify one of the prevailing forms of error, and to show that, however plausible the arguments might be by which it was defended, it was impossible that it should be true. Their own knowledge of the nature of religion must convince them at once that this opinion was false. That denieth that Jesus is the Christ - It would seem that the apostle referred to a class who admitted that Jesus lived, but who denied that he was the true Messiah. On what grounds they did this is unknown; but to maintain this was, of course, the same as to maintain that he was…”

“Who is that liar - Who is guilty of that lying, but he who denies that truth which is the sum of all Christianity? That Jesus is the Christ; that he is the Son of God; that he came in the flesh, is one undivided truth. and he that denies any part of this, in effect denies the whole. He is antichrist - And the spirit of antichrist, who in denying the Son denies the Father also. 1 John 2:23”

“2:22 John marks out as a liar any false teacher who denies that Jesus is the Christ, the Son of God, the unique revealer of the Father (4:2).”

“Who: Jo1 2:4, Jo1 1:6, Jo1 4:20; Joh 8:44; Rev 3:9 he that: Jo1 2:23, Jo1 4:3; Co1 12:2, Co1 12:3; Jo2 1:7; Jde 1:4 He is: Jo1 2:18 1 John 2:23”