“Who is a liar but he that denieth that Jesus is the Christ? He is antichrist, that denieth the Father and the Son.”
King James Version (KJV)
2:22 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.
1Jo 2:22 Who is a liar but he that denieth that Jesus is the Christ? Hence they will know how to reject these antichrists who lyingly deny Jesus Christ.