καὶ αὕτη ἐστὶν ἡ ἐντολὴ αὐτοῦ, ἵνα πιστεύσωμεν τῷ ὀνόματι τοῦ υἱοῦ αὐτοῦ Ἰησοῦ Χριστοῦ καὶ ἀγαπῶμεν ἀλλήλους καθὼς ἔδωκεν ἐντολήν.

1. καὶ
   and
2. αὕτη
   this
3. ἐστὶν
   is
4. ἡ
   the
   or
5. ἐντολὴ
   commandment
6. αὐτοῦ
   his
7.  
   ,
    
8. ἵνα
   so that
9. πιστεύσωμεν
   we might believe
   we will believe, we may believe
10. τῷ
    the
    to the
11. ὀνόματι
    name
12. τοῦ
    of the
    the
13. υἱοῦ
    son
14. αὐτοῦ
    his
15. Ἰησοῦ
    Jesus
16. Χριστοῦ
    Christ
17. καὶ
    and
18. ἀγαπῶμεν
    we love
    we should love
19. ἀλλήλους
    one another
20. καθὼς
    as
21. ἔδωκεν
    gave
    he gave
22. ἐντολήν
    commandment
23.  
    .
     

and this is his commandment, that we should believe in the name of his son Jesus Christ and love one another as he gave commandment.