I had been looking at all the orc speeches in the LotR (remembering some such insult somewhere) but of course in vain.
Well, thanks to your hint I guess I've found it now; it must be Thorin to Bilbo, after Bilbo had confessed about the arkenstone.
Quote:
"You seem all in leage!" said Thorin dropping Bilbo on the top of the wall. "Never again will I have dealings with any wizard or his friends. What have you to say, you descendant of rats?"
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