1 John 4:3

King James 3 - The Literal Traslation

And every spirit which does not confess that Jesus Christ has come in the flesh is not from God; and this is the antichrist which you heard is coming, and now is already in the world.

Cross References

Matthew 24:5

For many will come in My name, saying, I am the Christ. And they will cause many to be led astray.

1 John 2:18

Little children, it is a last hour, and as you heard that the antichrist is coming to be, even now many antichrists have come to be, from which you know that it is a last hour.

1 John 2:22

Who is the liar, if not the one denying, saying that Jesus is not the Christ? This is the antichrist, the one denying the Father and the Son.

2 John 1:7

Because many deceivers entered into the world, those not confessing Jesus Christ to have come in the flesh, this is the deceiver and the antichrist.