1 John 2:4; 1 John 2:22

1 John 2:4

4 If someone claims, "I know him well!" but doesn't keep his commandments, he's obviously a liar. His life doesn't match his words.

1 John 2:22

22 So who is lying here? It's the person who denies that Jesus is the Divine Christ, that's who. This is what makes an antichrist: denying the Father, denying the Son.