1 John 4:3

and every spirit that does not confess Jesus is not from God, and this is the [spirit] of the antichrist, [of] which you have heard that it is coming, and now it is already in the world.

1 John 2:18

Children, it is the last hour, and just as you have heard that antichrist is coming, even now many antichrists have arisen, by which we know that it is the last hour.

1 John 2:22

Who is the liar except the one who denies that Jesus is the Christ? This person is the antichrist, the one 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 Jesus Christ coming in [the] flesh. This person is the deceiver and the antichrist!

2 Thessalonians 2:3-8

Do not let anyone 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 just as you have heard that antichrist is coming, even now many antichrists have arisen, by which we know that it is the last hour.

For the mystery of lawlessness is at work already; only the one who now restrains [will do so] until he is out of the way,

For many deceivers have gone out into the world, those who do not confess Jesus Christ coming in [the] flesh. This person is the deceiver and the antichrist!

General references

And if you say {to yourself}, 'How can we know the word that Yahweh has not spoken to him?'

The one who is from God listens to the words of God. Because of this you do not listen--because you are not of God."