ὁ λέγων ἐν αὐτῷ μένειν ὀφείλει, καθὼς ἐκεῖνος περιεπάτησε, καὶ αὐτὸς οὕτω περιπατεῖν.

1. ὁ
   the
2. λέγων
   saying
3. ἐν
   in
4. αὐτῷ
   to him
5. μένειν
   to remain
6. ὀφείλει
   ought
7.  
   ,
    
8. καθὼς
   as
9. ἐκεῖνος
   that one
   that
10. περιεπάτησε
    walked
11.  
    ,
     
12. καὶ
    and
13. αὐτὸς
    himself
    he
14. οὕτω
    thus
15. περιπατεῖν
    to walk
16.  
    .
     

The one saying he remains in him ought to walk just as that one walked.