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. They went out from us, but they did not really belong to us. For if they had belonged to us, they would have remained with us; but their going showed that none of them belonged to us.
. . . Who is the liar? It is the man who denies that Jesus is the Christ. Such a man is the antichrist - he denies the Father and the Son. No one who denies the Son has the Father; whoever acknowledges the Son has the Father also.
1 John 2:18-19;22-23 (NIV)