1 John 4:3

A Conservative Version

and every spirit that does not confess Jesus Christ has come in flesh is not of God. And this is that of the antichrist, which ye have heard that it comes, and is now in the world already.

Cross References

1 John 2:22

Who is the liar if not he who denies that Jesus is the Christ? This is the antichrist, he who denies the Father and the Son.

2 John 1:7

Because many deceivers have gone forth into the world, those not acknowledging Jesus Christ coming in flesh. This is the deceiver and the antichrist.

1 John 2:18

Children, it is the last hour. And as ye heard that the antichrist comes, and now many antichrists have developed, from which we know that it is the last hour.

Matthew 24:5

For many will come in my name, saying, I am the Christ, and will lead many astray.