Dear children, this is the last hour; and as you have heard that the antichrist is coming, even now many antichrists have come. This is how we know it is the last hour.
NIV
Boys (lads), it is the last time (hour, the end of this age). And as you have heard that the antichrist [he who will oppose Christ in the guise of Christ] is coming, even now many antichrists have arisen, which confirms our belief that it is the final (the end) time.
AMP
Little children, it is the last time: and as ye have heard that antichrist shall come, even now are there many antichrists; whereby we know that it is the last time.
KJV
You, dear children, are from God and have overcome them, because the one who is in you is greater than the one who is in the world.
NIV
Little children, you are of God [you belong to Him] and have [already] defeated and overcome them [the agents of the antichrist], because He Who lives in you is greater (mightier) than he who is in the world.
AMP
Ye are of God, little children, and have overcome them: because greater is he that is in you, than he that is in the world.
KJV
Who is the liar? It is whoever denies that Jesus is the Messiah. Such a person is the antichrist – denying the Father and the Son.
NIV
Who is [such a] liar as he who denies that Jesus is the Christ (the Messiah)? He is the antichrist (the antagonist of Christ), who [habitually] denies and refuses to acknowledge the Father and the Son.
AMP
Who is a liar but he that denieth that Jesus is the Christ? He is antichrist, that denieth the Father and the Son.
KJV
The coming of the lawless one will be in accordance with how Satan works. He will use all sorts of displays of power through signs and wonders that serve the lie
NIV
The coming [of the lawless one, the antichrist] is through the activity and working of Satan and will be attended by great power and with all sorts of [pretended] miracles and signs and delusive marvels--[all of them] lying wonders--
AMP
Even him, whose coming is after the working of Satan with all power and signs and lying wonders,
KJV
But every spirit that does not acknowledge Jesus is not from God. This is the spirit of the antichrist, which you have heard is coming and even now is already in the world.
NIV
And every spirit which does not acknowledge and confess that Jesus Christ has come in the flesh [but would annul, destroy, sever, disunite Him] is not of God [does not proceed from Him]. This [nonconfession] is the [spirit] of the antichrist, [of] which you heard that it was coming, and now it is already in the world.
AMP
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.
KJV
And then the lawless one will be revealed, whom the Lord Jesus will overthrow with the breath of his mouth and destroy by the splendor of his coming.
NIV
And then the lawless one (the antichrist) will be revealed and the Lord Jesus will slay him with the breath of His mouth and bring him to an end by His appearing at His coming. [Isa. 11:4.]AMP
And then shall that Wicked be revealed, whom the Lord shall consume with the spirit of his mouth, and shall destroy with the brightness of his coming:
KJV
Many deceivers, who do not acknowledge Jesus Christ as coming in the flesh, have gone out into the world. Any such person is the deceiver and the antichrist.
NIV
For many imposters (seducers, deceivers, and false leaders) have gone out into the world, men who will not acknowledge (confess, admit) the coming of Jesus Christ (the Messiah) in bodily form. Such a one is the imposter (the seducer, the deceiver, the false leader, the antagonist of Christ) and the antichrist.
AMP
For many deceivers are entered into the world, who confess not that Jesus Christ is come in the flesh. This is a deceiver and an antichrist.
KJV