2 John 1:7

For many deceivers have gone out into the world--men who do not acknowledge Jesus as Christ who has come in human nature. Such a one is 'the deceiver' and 'the anti-Christ.'

1 John 4:1-3

Dear friends, do not believe every spirit, but put the spirits to the test to see whether they are from God; for many false teachers have gone out into the world.

1 John 2:26

I have thus written to you concerning those who are leading you astray.

John 1:14

And the Word came in the flesh, and lived for a time in our midst, so that we saw His glory--the glory as of the Father's only Son, sent from His presence. He was full of grace and truth.

1 Timothy 3:16

And, beyond controversy, great is the mystery of our religion-- that Christ appeared in human form, and His claims justified by the Spirit, was seen by angels and proclaimed among Gentile nations, was believed on in the world, and received up again into glory.

2 Peter 2:1-3

But there were also false prophets among the people, as there will be teachers of falsehood among you also, who will cunningly introduce fatal divisions, disowning even the Sovereign Lord who has redeemed them, and bringing on themselves swift destruction.

1 John 2:18-22

Dear children, the last hour has come; and as you once heard that there was to be an anti-Christ, so even now many anti-Christs have appeared. By this we may know that the last hour has come.

Revelation 12:9

The great Dragon, the ancient serpent, he who is called 'the Devil' and 'the Adversary' and leads the whole earth astray, was hurled down: he was hurled down to the earth, and his angels were hurled down with him.

Revelation 13:14

And his power of leading astray the inhabitants of the earth is due to the marvels which he has been permitted to work in the presence of the Wild Beast. And he told the inhabitants of the earth to erect a statue to the Wild Beast who had received the sword-stroke and yet had recovered.

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, as there will be teachers of falsehood among you also, who will cunningly introduce fatal divisions, disowning even the Sovereign Lord who has redeemed them, and bringing on themselves swift destruction.
1 John 2:18
Dear children, the last hour has come; and as you once heard that there was to be an anti-Christ, so even now many anti-Christs have appeared. By this we may know that the last hour has come.
1 John 4:1
Dear friends, do not believe every spirit, but put the spirits to the test to see whether they are from God; for many false teachers have gone out into the world.

Who

John 1:14
And the Word came in the flesh, and lived for a time in our midst, so that we saw His glory--the glory as of the Father's only Son, sent from His presence. He was full of grace and truth.
1 Timothy 3:16
And, beyond controversy, great is the mystery of our religion-- that Christ appeared in human form, and His claims justified by the Spirit, was seen by angels and proclaimed among Gentile nations, was believed on in the world, and received up again into glory.
1 John 4:2
The test by which you may recognize the Spirit of God is that every spirit which acknowledges that Jesus Christ has come as man is from God,
Revelation 12:9
The great Dragon, the ancient serpent, he who is called 'the Devil' and 'the Adversary' and leads the whole earth astray, was hurled down: he was hurled down to the earth, and his angels were hurled down with him.
Revelation 13:14
And his power of leading astray the inhabitants of the earth is due to the marvels which he has been permitted to work in the presence of the Wild Beast. And he told the inhabitants of the earth to erect a statue to the Wild Beast who had received the sword-stroke and yet had recovered.

This is

1 John 2:22
Who is a liar compared with him who denies that Jesus is the Christ? He who disowns the Father and the Son is the anti-Christ.
1 John 4:3
and that no spirit is from God which does not acknowledge this about Jesus. Such is the spirit of the anti-Christ; of whose coming you have heard, and it is already in the world.