For pity's sake!

for pity's sake

A mild oath of surprise, exasperation, annoyance, frustration, or anger. For pity's sake! I haven't seen you in years! Would you let me finish my story, for pity's sake? Oh for pity's sake, I just had the car fixed and now you've put a dent in it!
See also: for, sake
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

For pity’s sake!

verb
See also: for
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
References in classic literature ?
But release my arm, master, for pity's sake! You have a hand like a pair of pincers."
that knife, give it to me for a minute only, for mercy's, for pity's sake! I will embrace your knees!
A FOR pity's sake! The poor girl must feel like a walking sex experiment.
Ruin dimwit Shelley's life by all means, but KEEP YOUR MOUTH STILL for pity's sake!
He even had a Home Office licence for pity's sake! So he simply carried on.