From Longman Dictionary of Contemporary English(a case of) the pot calling the kettle black(a case of) the pot calling the kettle blackinformalCRITICIZE used humorously to say that you should not criticize someone for something, because you have done the same thing or have the same fault → pot
Examples from the Corpus
(a case of) the pot calling the kettle black• It was a bit like the pot calling the kettle black. 