Look who’s talking!

look who's talking

One is guilty of the same thing they have just criticized. A: "Kathy never pays attention in class." B: "Look who's talking! Just today I saw you reading a magazine during the lecture."
See also: look, talk
Farlex Dictionary of Idioms.

Look who’s talking!

exclam. You are just as guilty!; You are just as much at fault! Look who’s talking. You were there before I was.
See also: look
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • look who's talking
  • Look who's talking!
  • pot calling the kettle black, the
  • you can talk
  • you can/can't talk
  • you should talk
  • you're a fine one to talk
  • hark who's talking
  • Look who's here!
  • pay(s) your money and take(s) your choice, you