Aristotle begins the 4th chapter of the 3rd book of the Nicomachean Ethics with the line
As was stated before, willing is concerned with the end.
Unfortunately it's not clear where this claim was "stated before." It does not seem to appear anywhere in Book 3 (prior to chapter 4). Nor can I find it in Books 1 or 2, unless it is a veiled reference (e.g., in the opening line of the NE). The closest instance I can find is from Book 3 (1111b23):
Moreover, wishing is directed rather to the end, and choice to the means.
Is it possible that he's identifying wishing and willing? Or is the aforementioned allusion just a mistake in Aristotle's notes? None of the modern commentaries I've seen answer this question.
Source: NE book 3.