1 John 2:4; 1 John 2:22

1 John 2:4

4 The one who claims, "I know him," while not keeping his commandments, is a liar, and the truth is not in this person.

1 John 2:22

22 Who is the liar? Isn't it the person who denies that Jesus is the Christ? This person is the antichrist: the one who denies the Father and the Son.