Wednesday Morsel

So I had a thought. (Yeah, it happens... sometimes they're even useful thoughts.)

I should see if anyone can guess where the quote came from rather than just telling you. Fun, right?

So here goes-- this week's quote: (we'll start with an easy one...)

"She stopped again, and then said, in a very matter-of-fact tone, 'You look in excellent health to me, Potter, so you will excuse me if I don't let you off homework today. I assure you that if you die, you need not hand it in.'"

Name the book! (Bonus points for knowing what character "she" is.)