for Pete's sake
Also, for pity's sake. See for the sake of, def. 3.
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
Also, for pity's sake. See for the sake of, def. 3.