ὁ πιστεύων εἰς τὸν υἱὸν τοῦ Θεοῦ ἔχει τὴν μαρτυρίαν ἐν αὐτῷ· ὁ μὴ πιστεύων τῷ Θεῷ ψεύστην πεποίηκεν αὐτόν, ὅτι οὐ πεπίστευκεν εἰς τὴν μαρτυρίαν ἣν μεμαρτύρηκεν ὁ Θεὸς περὶ τοῦ υἱοῦ αὐτοῦ.

1. ὁ
   the
2. πιστεύων
   believing
   trusting
3. εἰς
   into
4. τὸν
   the
5. υἱὸν
   son
6. τοῦ
   of the
   the
7. Θεοῦ
   God
8. ἔχει
   has
9. τὴν
   the
10. μαρτυρίαν
    testimony
11. ἐν
    in
12. αὐτῷ
    to him
13.  
    ·
     
14. ὁ
    the
15. μὴ
    not
16. πιστεύων
    believing
    trusting
17. τῷ
    the
    to the
18. Θεῷ
    God
19. ψεύστην
    liar
20. πεποίηκεν
    has made
21. αὐτόν
    him
22.  
    ,
     
23. ὅτι
    that
    because
24. οὐ
    not
25. πεπίστευκεν
    has believed
26. εἰς
    into
27. τὴν
    the
28. μαρτυρίαν
    testimony
29. ἣν
    was
30. μεμαρτύρηκεν
    has testified
31. ὁ
    the
32. Θεὸς
    God
33. περὶ
    about
    concerning
34. τοῦ
    of the
    the
35. υἱοῦ
    son
36. αὐτοῦ
    his
37.  
    .
     

The one who believes in the son of God has the testimony in him; the one who does not believe God has made him a liar, because he has not believed in the testimony which God has testified concerning his son.