1 John 4:3

Revised Standard Version (RSV-CI)

and every spirit which does not confess Jesus is not of God. This is the spirit of antichrist, of which you heard that it was coming, and now it is in the world already.

Cross References

Matthew 24:5

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

1 John 2:18

Children, it is the last hour; and as you have heard that antichrist is coming, so now many antichrists have come; therefore we know that it is the last hour.

1 John 2:22

Who is the liar but he who denies that Jesus is the Christ? This is the antichrist, he who denies the Father and the Son.

2 John 1:7

For many deceivers have gone out into the world, men who will not acknowledge the coming of Jesus Christ in the flesh; such a one is the deceiver and the antichrist.