2 John 1:7

For many deceivers have entered into the world, who do not confess Jesus Christ coming in the flesh. This is the deceiver and the anti-christ.

1 John 4:1-3

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

1 John 2:26

These things I have written to you concerning those leading you astray.

John 1:14

And the Word became flesh, and tabernacled among us. And we beheld His glory, the glory as of the only begotten of the Father, full of grace and of truth.

1 Timothy 3:16

And without controversy great is the mystery of godliness: God was manifested in the flesh, justified in the Spirit, seen by angels, preached among nations, believed on in the world, and received up into glory.

2 Peter 2:1-3

But there were also false prophets among the people, even as there will be false teachers among you, who secretly will bring in destructive heresies, even denying the Master who bought them, bringing on themselves swift destruction.

1 John 2:18-22

Little children, it is the last time. And just as you have heard that antichrist is coming, even now many antichrists have risen up, from which we know that it is the last hour.

Revelation 12:9

And the great dragon was cast out, the old serpent called Devil, and Satan, who deceives the whole world. He was cast out into the earth, and his angels were cast out with him.

Revelation 13:14

And it deceives those dwelling on the earth, because of the miracles which were given to it to do before the beast, saying to those dwelling on the earth that they should make an image to the beast who had the wound by a sword and lived.

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
But there were also false prophets among the people, even as there will be false teachers among you, who secretly will bring in destructive heresies, even denying the Master who bought them, bringing on themselves swift destruction.
1 John 2:18
Little children, it is the last time. And just as you have heard that antichrist is coming, even now many antichrists have risen up, from which we know that it is the last hour.
1 John 4:1
Beloved, do not believe every spirit, but try the spirits to see if they are of God, because many false prophets have gone out into the world.

Who

John 1:14
And the Word became flesh, and tabernacled among us. And we beheld His glory, the glory as of the only begotten of the Father, full of grace and of truth.
1 Timothy 3:16
And without controversy great is the mystery of godliness: God was manifested in the flesh, justified in the Spirit, seen by angels, preached among nations, believed on in the world, and received up into glory.
1 John 4:2
By this you know the Spirit of God: every spirit that confesses that Jesus Christ has come in the flesh is of God;
Revelation 12:9
And the great dragon was cast out, the old serpent called Devil, and Satan, who deceives the whole world. He was cast out into the earth, and his angels were cast out with him.
Revelation 13:14
And it deceives those dwelling on the earth, because of the miracles which were given to it to do before the beast, saying to those dwelling on the earth that they should make an image to the beast who had the wound by a sword and lived.

This is

1 John 2:22
Who is a liar but he who denies that Jesus is the Christ? He who denies the Father and the Son is antichrist.
1 John 4:3
and every spirit that does not confess that Jesus Christ has come in the flesh is not of God. And this is the antichrist you heard is coming, and even now is already in the world.