καὶ τότε ἐάν τις ὑμῖν εἴπῃ, ἰδοὺ ὧδε ὁ Χριστός, ἰδοὺ ἐκεῖ, μὴ πιστεύετε.

1. καὶ
   and
2. τότε
   then
3. ἐάν
   if
4. τις
   someone
   who
5. ὑμῖν
   to you
6. εἴπῃ
   he says
   says, he should say
7.  
   ,
    
8. ἰδοὺ
   behold
9. ὧδε
   here
   thus
10. ὁ
    the
11. Χριστός
    Christ
12.  
    ,
     
13. ἰδοὺ
    behold
14. ἐκεῖ
    there
15.  
    ,
     
16. μὴ
    not
17. πιστεύετε
    believe
    you believe
18.  
    .
     

And then if someone should say to you, Behold, here is the Christ, or Behold, there, do not believe it.