καὶ ἐρεῖς πρὸς αὐτοὺς, ἀνὴρ ἢ γυνὴ, ὃς ἂν μεγάλως εὔξηται εὐχὴν ἀφαγνίσασθαι ἁγνείαν Κυρίῳ,

1. καὶ
   and
2. ἐρεῖς
   you will say
3. πρὸς
   to
   toward
4. αὐτοὺς
   them
5.  
   ,
    
6. ἀνὴρ
   man
7. ἢ
   the
   or
8. γυνὴ
   woman
9.  
   ,
    
10. ὃς
    who
11. ἂν
    would
12. μεγάλως
    greatly
13. εὔξηται
    vows
    should vow, she vows
14. εὐχὴν
    vow
15. ἀφαγνίσασθαι
    to consecrate
    to purify
16. ἁγνείαν
    purity
17. Κυρίῳ
    Lord
18.  
    ,
     

and you will say to them, A man or woman who makes a great vow to consecrate purity to the Lord,