1 John 4:3

But every spirit who does not acknowledge Jesus is not from God. This is the spirit of the antichrist. You have heard that he is coming, and now he is already in the world.

1 John 2:18

Little children, it is the last hour. Just as you heard that an antichrist is coming, so now many antichrists have appeared. This is how we know it is the last hour.

1 John 2:22

Who is a liar but the person who denies that Jesus is the Messiah? The person who denies the Father and the Son is an antichrist.

2 John 1:7

For many deceivers have gone out into the world. They refuse to acknowledge Jesus the Messiah as having become human. Any such person is a deceiver and an antichrist.

2 Thessalonians 2:3-8

Do not let anyone deceive you in any way, for it will not come unless the rebellion takes place first and the man of sin, who is destined for destruction, is revealed.

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. Just as you heard that an antichrist is coming, so now many antichrists have appeared. This is how we know it is the last hour.

For the secret of this lawlessness is already at work, but only until the person now holding it back gets out of the way.

For many deceivers have gone out into the world. They refuse to acknowledge Jesus the Messiah as having become human. Any such person is a deceiver and an antichrist.

General references

Now you may ask yourselves, "How will we be able to discern that the LORD has not spoken?'

The one who belongs to God listens to the words of God. The reason you don't listen is because you don't belong to God."