1 John 4:3

And, every spirit that doth not confess Jesus, of God, is not. And, this, is the spirit of the Antichrist, touching which ye have heard that it cometh: even now, is it, in the world, already.

1 John 2:18

Little children! it is, the last hour; and, just as ye have heard that, an antichrist, is coming, even now, antichrists have become, many, whence we perceive that it is, the last hour:

1 John 2:22

Who, is the False One; - save he that denieth that, Jesus, is the Christ? The same, is the Antichrist, - he that denieth the Father and the Son.

2 Thessalonians 2:3-8

That no one may cheat, you, in any one respect. Because that day will not set in - except the revolt come first, and there he revealed the man of lawlessness, the son of destruction,

Treasury of Scripture Knowledge

Summary

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.

General references

Bible References

And this

1 John 2:18
Little children! it is, the last hour; and, just as ye have heard that, an antichrist, is coming, even now, antichrists have become, many, whence we perceive that it is, the last hour:
2 Thessalonians 2:7
For, the secret, of lawlessness, already, is inwardly working itself, - only, until, he that restraineth at present, shall be gone, out of the midst:

General references

Deuteronomy 18:21
And, when thou shalt say in thy heart, - In what manner shall we know the word which Yahweh hath not spoken!?,
John 8:47
He that is of God, heareth, the sayings of God; therefore, do, ye, not hear, because, of God, ye are not.