2 John 1:7

For many deceivers have gone out into the world, they who do not confess Jesus Christ coming in flesh this 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 are gone out into the world.

1 John 2:26

These things have I written to you concerning those who lead you astray:

John 1:14

And the Word became flesh, and dwelt among us (and we have contemplated his glory, a glory as of an only-begotten with a father), full of grace and truth;

1 Timothy 3:16

And confessedly the mystery of piety is great. God has been manifested in flesh, has been justified in the Spirit, has appeared to angels, has been preached among the nations, has been believed on in the world, has been received up in glory.

2 Peter 2:1-3

But there were false prophets also among the people, as there shall be also among you false teachers, who shall bring in by the bye destructive heresies, and deny the master that bought them, bringing upon themselves swift destruction;

1 John 2:18-22

Little children, it is the last hour, and, according as ye have heard that antichrist comes, even now there have come many antichrists, whence we know that it is the last hour.

Revelation 12:9

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

Revelation 13:14

And it deceives those that dwell upon the earth by reason of the signs which it was given to it to work before the beast, saying to those that dwell upon the earth to make an image to the beast, which has the wound of the 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 false prophets also among the people, as there shall be also among you false teachers, who shall bring in by the bye destructive heresies, and deny the master that bought them, bringing upon themselves swift destruction;
1 John 2:18
Little children, it is the last hour, and, according as ye have heard that antichrist comes, even now there have come many antichrists, whence 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 are gone out into the world.

Who

John 1:14
And the Word became flesh, and dwelt among us (and we have contemplated his glory, a glory as of an only-begotten with a father), full of grace and truth;
1 Timothy 3:16
And confessedly the mystery of piety is great. God has been manifested in flesh, has been justified in the Spirit, has appeared to angels, has been preached among the nations, has been believed on in the world, has been received up in glory.
1 John 4:2
Hereby ye know the Spirit of God: every spirit which confesses Jesus Christ come in flesh is of God;
Revelation 12:9
And the great dragon was cast out, the ancient serpent, he who is called Devil and Satan, he who deceives the whole habitable world, he was cast out into the earth, and his angels were cast out with him.
Revelation 13:14
And it deceives those that dwell upon the earth by reason of the signs which it was given to it to work before the beast, saying to those that dwell upon the earth to make an image to the beast, which has the wound of the sword, and lived.

This is

1 John 2:22
Who is the liar but he who denies that Jesus is the Christ? He is the antichrist who denies the Father and the Son.
1 John 4:3
and every spirit which does not confess Jesus Christ come in flesh is not of God: and this is that power of the antichrist, of which ye have heard that it comes, and now it is already in the world.