Ἀμὴν ἀμὴν λέγω ὑμῖν

ἀμὴν ἀμὴν λέγω ὑμῖν

Truly, truly I say to you all (you - plural) (John 1:51 and many other places)

There is also a singular version:

ἀμὴν ἀμὴν λέγω σοι

Truly, truly I say to you (you - singular) (John 3:3 and many other places)


 * Note ὑμῖν and σοι are both in the dative case. "To you".