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Phrase(s): The pot is calling the kettle black. [and] That’s the pot calling the kettle black.
Prov. You should not criticize someone for a fault that you have too. (Not polite to say about the person you are addressing.) • Bill told Barbara she was sloppy, but Bill never cleans up after himself, either. That’s the pot calling the kettle black. • My sister says I dress funny, but if you’ve seen some of the clothes she wears, you know it’s a case of the pot calling the kettle black.
McGrawhill's American Idioms And Phrasal Verbs