Looking for that certain phrase

[erinellii]

Can anyone help me?  I'm trying to write an enormously long post for 
the main list, and I know there's this sentence in one of the books 
that goes something like "Ron said a word he would not have if Mrs. 
Weasley had been there"

That's not an exact quote of course.  The problem is, it's a very 
small line and I have no idea which book it is in, except probably 
not SS.  So if this just jumps out at anyone and you can point me to 
a book and chapter, I'd be extremely grateful.

Thanks,
Erin