1John 2:22-23
Who is a liar but he that denies that Jesus is the christ? He is anti-christ who denies the father and the son.
Whoever denies the son does not have the father either; he who acknowledges the son has the father also.

2John:7
For many deceivers have gone out into the world who do not confess Jesus christ as coming in the flesh. This is a deceiver and an anti-christ.