@gellner,
I am not the Greek expert, but I can refer you to a website where you can
search for passage in Greek by chapter and verse.
http://www.greekbible.com/index.php
I tried Luke 23:34 and got this:
[[ὁ δὲ Ἰησοῦς ??"λεγεν, Πάτερ, ἄφες αὐτο??-ς, οὐ γὰρ οἴδασιν τί ποιοῦσιν.]]
διαμεριζόμενοι δὲ τὰ ἱμάτια αὐτοῦ ??"βαλον κλήρους.
From what very little Greek I recall, I belive this is the phrase you want:
Πάτερ, ἄφες αὐτο??-ς, οὐ γὰρ οἴδασιν τί ποιοῦσιν.
Hope this helps.