1 John 4:3

and every spirit which confesses him not, is not from God. And this is that spirit of Antichrist of which you have heard that it is coming, and that now it is already in the world.

1 John 2:18

My children, this is the last hour, and as you have heard that an antichrist was coming, and now many antichrists are already risen, whence we may know that it is the last hour.

1 John 2:22

Who is the liar if not the man who denies that Jesus is the Christ? This is the Antichrist, even he who disowns the Father and the Son.

2 John 1:7

I say this because many deceivers are gone forth into the world, those who deny the coming of Jesus Christ in the flesh. This is the deceiver and the Antichrist.

2 Thessalonians 2:3-8

Let no one deceive you by any means. For it will not come until after the Great Apostasy, and the revealing of the Man of Sin, 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

John 8:47

Bible References

And this

My children, this is the last hour, and as you have heard that an antichrist was coming, and now many antichrists are already risen, whence we may know that it is the last hour.

For the mystery of lawlessness is already at work; only there is one who is hindering and will continue to hinder till he be removed;

I say this because many deceivers are gone forth into the world, those who deny the coming of Jesus Christ in the flesh. This is the deceiver and the Antichrist.

General references

"He who is from God listens to God's words. For this reason you do not listen, because you are not from God."