1 John 4:3

and every spirit that does not confess Jesus is not from God. This is the spirit of the antichrist, which you heard was coming and now is in the world already.

1 John 2:18

Children, it is the last hour, and as you have heard that antichrist is coming, so now many antichrists have come. Therefore we know that it is the last hour.

1 John 2:22

Who is the liar but he who denies that Jesus is the Christ? This is the antichrist, he who denies the Father and the Son.

2 John 1:7

For many deceivers have gone out into the world, those who do not confess the coming of Jesus Christ in the flesh. Such a one is the deceiver and the antichrist.

2 Thessalonians 2:3-8

Let no one deceive you in any way. For that day will not come, unless the rebellion comes first, and the man of lawlessness is revealed, the son of destruction,

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

Children, it is the last hour, and as you have heard that antichrist is coming, so now many antichrists have come. Therefore we know that it is the last hour.

For the mystery of lawlessness is already at work. Only he who now restrains it will do so until he is out of the way.

For many deceivers have gone out into the world, those who do not confess the coming of Jesus Christ in the flesh. Such a one is the deceiver and the antichrist.

General references

And if you say in your heart, 'How may we know the word that the LORD has not spoken?'--

Whoever is of God hears the words of God. The reason why you do not hear them is that you are not of God."