2 John 1:7

Because many deceivers have gone out into the world, who do not confess that Jesus Christ is coming in the flesh; the same is the deceiver and the antichrist.

1 John 4:1-3

Beloved, believe not every spirit, but prove the spirits if they are of God: because many false prophets have gone out into the world.

1 John 2:26

I have written these things unto you concerning those deceiving you.

John 1:14

The Word was made flesh, and tented among us (and we beheld His glory, the glory as of the only begotten with the Father), full of grace and truth.

1 Timothy 3:16

And assuredly great is the mystery of godliness; Who is manifested in the flesh, was justified in the spirit, was seen of angels, was preached among the Gentiles, was believed on in the world, was taken up in glory.

2 Peter 2:1-3

However there were indeed false prophets among the people, as there will also be false teachers among you, whosoever shall bring in destructive heresies, even denying the Lord who bought them, bringing on themselves swift destruction.

1 John 2:18-22

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

Revelation 12:9

And the great dragon, the old serpent, the one called the devil, and Satan, the one deceiving the whole world, was cast out: he was cast out into the earth, and his angels were cast out with him.

Revelation 13:14

And he deceives those dwelling upon the earth through the signs which it was given unto him to perform in the presence of the beast, saying to those dwelling on the earth, that they should make an image to the beast, who had the wound of the sword, and did live.

Treasury of Scripture Knowledge

Summary

For many deceivers are entered into the world, who confess not that Jesus Christ is come in the flesh. This is a deceiver and an antichrist.

Bible References

Many

2 Peter 2:1
However there were indeed false prophets among the people, as there will also be false teachers among you, whosoever shall bring in destructive heresies, even denying the Lord who bought them, bringing on themselves swift destruction.
1 John 2:18
Little children, it is the last hour: and as you have heard that antichrist is coming, even now many antichrists have come, from which we know that it is the last hour.
1 John 4:1
Beloved, believe not every spirit, but prove the spirits if they are of God: because many false prophets have gone out into the world.

Who

John 1:14
The Word was made flesh, and tented among us (and we beheld His glory, the glory as of the only begotten with the Father), full of grace and truth.
1 Timothy 3:16
And assuredly great is the mystery of godliness; Who is manifested in the flesh, was justified in the spirit, was seen of angels, was preached among the Gentiles, was believed on in the world, was taken up in glory.
1 John 4:2
In this you know the Spirit of God: every spirit which confesses that Jesus Christ has come in the flesh is of God:
Revelation 12:9
And the great dragon, the old serpent, the one called the devil, and Satan, the one deceiving the whole world, was cast out: he was cast out into the earth, and his angels were cast out with him.
Revelation 13:14
And he deceives those dwelling upon the earth through the signs which it was given unto him to perform in the presence of the beast, saying to those dwelling on the earth, that they should make an image to the beast, who had the wound of the sword, and did live.

This is

1 John 2:22
Who is a liar except the one denying that Jesus is the Christ? This one is the antichrist, the one denying the Father and the Son.
1 John 4:3
and every spirit which does not confess Jesus is not of God: and this is the spirit of antichrist, which you have heard that he is coming; and now he is already in the world.