1 John 4:3

and that no spirit is from God which does not acknowledge this about Jesus. Such is the spirit of the anti-Christ; of whose coming you have heard, and it is already in the world.

1 John 2:18

Dear children, the last hour has come; and as you once heard that there was to be an anti-Christ, so even now many anti-Christs have appeared. By this we may know that the last hour has come.

1 John 2:22

Who is a liar compared with him who denies that Jesus is the Christ? He who disowns the Father and the Son is the anti-Christ.

2 John 1:7

For many deceivers have gone out into the world--men who do not acknowledge Jesus as Christ who has come in human nature. Such a one is 'the deceiver' and 'the anti-Christ.'

2 Thessalonians 2:3-8

Let no one in any way deceive you, for that day cannot come without the coming of the apostasy first, and the appearing of the man of sin, the son of perdition, who sets himself against,

Treasury of Scripture Knowledge

Summary

1 John 4:3

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.

And this

1 John 2:18

2 Thessalonians 2:7

2 John 1:7

General references

John 8:47

Bible References

And this

Dear children, the last hour has come; and as you once heard that there was to be an anti-Christ, so even now many anti-Christs have appeared. By this we may know that the last hour has come.

For lawlessness is already at work in secret; but only until the man who is now exercising a restraining influence is removed,

For many deceivers have gone out into the world--men who do not acknowledge Jesus as Christ who has come in human nature. Such a one is 'the deceiver' and 'the anti-Christ.'

General references

He who is a child of God listens to God's words. You do not listen to them: and why? It is because you are not God's children."