POT CALL THE KETTLE BLACK

{informal} The person who is criticizing someone else is as guilty as the person he accuses; the charge is as true of the person who makes it as of the one he makes it against. * /When the commissioner accused the road builder of bribery, the contractor said the pot was calling the kettle black./ * /Bill said John was cheating at a game but John replied that the pot was calling the kettle black./