[Archaea]

Here's the entire verse, with the last two words being those in question.

πάντων τε καταπεσόντων ἡμῶν εἰς τὴν γῆν ἤκουσα φωνὴν λέγουσαν πρός με τῇ Ἑβραΐδι διαλέκτῳ Σαοὺλ Σαούλ τί με διώκεις σκληρόν σοι πρὸς κέντρα λακτίζειν

λακτίζειν

This is verb, laktizw, kick or spurn, even though it also means "to recalcitrate". It's in the present active infinitive form.

Now that I look at the sentence, it's a little harder for a novice to translate.