1 John 4:3
And every spirit which acknowledges not Jesus Christ having come in the flesh is not of God: and this is that of antichrist which ye have heard comes; and now is already in the world.
1 John 2:18
Young children, it is the last hour: and as ye have heard that antichrist comes, and now many antichrists have come; whence we know that it is the last hour.
1 John 2:22
Who is a liar if not he denying that Jesus is the Christ? He is antichrist, denying the Father and the Son.
2 John 1:7
For many cheats come into the world, they not acknowledging Jesus Christ coming in the flesh. This is the cheat and antichrist.
2 Thessalonians 2:3-8
Let none deceive you in any manner: for, except an apostasy come first, and the man of sin be revealed, the son of perdition;