Antichrist (ἀντίχριστος)
The Apostle John writes of the antichrist (ἀντίχριστος) in his first and second letters to the Church. Antichrist is a word created by combining a preposition (ἀντί) expressing opposition and Christ (Χριστός); therefore, it defines one who is against Christ.
We are first introduced to the concept of the antichrist in 1 John 2:18, where John writes about how we know it is the last hour. My little children, it is the last hour, and just as you heard that an antichrist is coming, now also many antichrists have come, by which we experientially know it is the last hour. The antichrist is the liar who denies that Jesus is the Messiah, 1 John 2:22. Who is the liar, except the one denying that Jesus is the Messiah? This one is the antichrist, the one denying the Father and the Son. Although these antichrists may claim to be from the Father, the ones that oppose Christ also reject the Father, 1 John 2:23. Everyone who denies the Son does not have the Father, the one verbally agreeing, has the Son and the Father. Every spirit that does not verbally agree that Jesus has come in the flesh is the antichrist, 1 John 4:3. and every spirit which does not confess (verbally agree) the Jesus is not out from God, and this is the [spirit] of the antichrist, which you have heard that is coming and now already is in the world. They are the deceivers who have gone out into the world, some even out from the assemblies, from the beginning of the Church, denying that Jesus has come in the flesh, 2 John 7. The antichrist is one who causes others to wander away […]