1 John 4:3

And every spirit which does not say this is not from God: this is the spirit of Antichrist, of which you have had word; and it is in the world even now.

1 John 2:18

Little children, it is the last hour; and as you were given word that the Antichrist would come, so now a number of Antichrists have come to you; and by this we are certain that it is the last hour.

1 John 2:22

Who is false but he who says that Jesus is not the Christ? He is the Antichrist who has no belief in the Father or the Son.

2 John 1:7

Because a number of false teachers have gone out into the world, who do not give witness that Jesus Christ came in the flesh. Such a one is a false teacher and Antichrist.

2 Thessalonians 2:3-8

Give no belief to false words: because there will first be a falling away from the faith, and the revelation of the man of sin, 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

Little children, it is the last hour; and as you were given word that the Antichrist would come, so now a number of Antichrists have come to you; and by this we are certain that it is the last hour.

For the secret of evil is even now at work: but there is one who is keeping back the evil till he is taken out of the way.

Because a number of false teachers have gone out into the world, who do not give witness that Jesus Christ came in the flesh. Such a one is a false teacher and Antichrist.

General references

And if you say in your hearts, How are we to be certain that the word does not come from the Lord?

He who is a child of God gives ear to the words of God: your ears are not open to them because you are not from God.