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.

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 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.

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.

2 Thessalonians 2:3-8

Let not anyone deceive you by any means. For that Day shall not come unless there first comes a falling away, and the man of sin shall be revealed, the son of perdition,

Treasury of Scripture Knowledge

Summary

1 John 4:3

And every spirit that confesseth not that Jesus Christ is come in the flesh is not of God: and this is that spirit of antichrist, whereof ye have heard that it should come; and even now already is it in the world.

And this

1 John 2:18

2 Thessalonians 2:7

2 John 1:7

General references

Deuteronomy 18:21

John 8:47

Bible References

And this

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.

For the mystery of lawlessness is already working, only he is now holding back until it comes out of the midst.

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.

General references

And if you say in your heart, How shall we know the word which Jehovah has not spoken?

He who is of God hears God's Words. Therefore you do not hear them because you are not of God.