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Here it is an adverb modifying ἐρέω "I will say it out of myself", which later became a preverb. You can also say that ἔκ...ἐρέω is a tmesis for ἐξερέω
Thanks Skylax,
I was just getting started in the next chapter and there I saw [size=150]ἐξείρω[/size] as a vocabulary word. I figured that this may the answer to my question.
I would not have been able to figure out the meaning as an adverb though.