1 John 2:4

4The [one]ὁsayingλέγωνὅτιI have knownἜγνωκαHimαὐτὸνandκαὶtheτὰςcommandmentsἐντολὰςof Himαὐτοῦnotμὴkeepingτηρῶνa liarψεύστηςhe isἐστίν,andκαὶinἐνhimτούτῳtheἡtruthἀλήθειαnotοὐκisἔστιν·

The one saying, “I have known Him,” and not keeping His commandments, he is a liar, and the truth is not in him.