τίς ἐστιν ὁ ψεύστης εἰ μὴ ὁ ἀρνούμενος ὅτι Ἰησοῦς οὐκ ἔστιν ὁ Χριστός; οὗτός ἐστιν ὁ ἀντίχριστος, ὁ ἀρνούμενος τὸν πατέρα καὶ τὸν υἱόν.

1. τίς
   someone
   who
2. ἐστιν
   is
3. ὁ
   the
4. ψεύστης
   liar
5. εἰ
   if
6. μὴ
   not
7. ὁ
   the
8. ἀρνούμενος
   denying
9. ὅτι
   that
   because
10. Ἰησοῦς
    Jesus
11. οὐκ
    not
12. ἔστιν
    is
13. ὁ
    the
14. Χριστός
    Christ
15.  
    ;
     
16. οὗτός
    this
17. ἐστιν
    is
18. ὁ
    the
19. ἀντίχριστος
    antichrist
20.  
    ,
     
21. ὁ
    the
22. ἀρνούμενος
    denying
23. τὸν
    the
24. πατέρα
    father
25. καὶ
    and
26. τὸν
    the
27. υἱόν
    son
28.  
    .
     

Who is the liar if not the one denying that Jesus is the Christ? This is the antichrist, the one denying the father and the son.