1 John 2:18 

18  Young children, it is the last hour, and just as you have heard that the antichrist is coming, even now many antichrists have appeared, from which fact we know that it is the last hour.

Denies that Jesus is the Christ (Messiah) or denies that he is the Son of God.​

1 John 2:​22.

 

22  Who is the liar but the one who denies that Jesus is the Christ? This is the antichrist, the one who denies the Father and the Son.

Opposes the Christ, God’s Anointed One.​—Psalm 2:​1, 2; Luke 11:23

Psalm 2:1, 2

 Why are the nations agitated And the peoples muttering* an empty thing? 2  The kings of the earth take their stand And high officials gather together* as one Against Jehovah and against his anointed one.

Luke 11:23

23  Whoever is not on my side is against me, and whoever does not gather with me scatters.

 Pretends to be the Christ. -Matthew 24:24

24  For false Christs and false prophets will arise and will perform great signs and wonders so as to mislead, if possible, even the chosen ones.

 Persecutes the followers of Christ, since Jesus views what is done to them as being done to him.​—Acts 9:5.

 

 He asked: “Who are you, Lord?” He said: “I am Jesus, whom you are persecuting.

 Falsely claims to be a Christian while practicing lawlessness or deception.​—Matthew 7:​22, 23; 2 Corinthians 11:13.

 

Matthew 7:22, 23

22  Many will say to me in that day: ‘Lord, Lord, did we not prophesy in your name, and expel demons in your name, and perform many powerful works* in your name?’ 23  And then I will declare to them: ‘I never knew* you! Get away from me, you workers of lawlessness!

 2 Corinthians 11:13

13  For such men are false apostles, deceitful workers, disguising themselves as apostles of Christ

 

Besides speaking of individuals who take such actions as being antichrists, the Bible also refers to them collectively as “the antichrist.” (2 John 7) The antichrist first appeared in the time of the apostles and has been active ever since. Bible prophecy foretold just such a development.​—1 John 4:3.

How to identify antichrists

  •  They promote false ideas related to Jesus. (Matthew 24:​9, 11) For example, those who teach the Trinity or that Jesus is Almighty God actually oppose the teachings of Jesus, who said: “The Father is greater than I am.”​—John 14:28.

  •  Antichrists reject what Jesus said about how God’s Kingdom operates. For instance, some religious leaders say that Christ works through human governments. Yet, this teaching contradicts Jesus, who said: “My Kingdom is no part of this world.”​John 18:36.

  •  They say that Jesus is their Lord, but they do not obey his commands, including the one to preach the good news of the Kingdom.​—Matthew 28:19, 20; Luke 6:​46; Acts 10:42.