pot calling the kettle black, the

Idioms  

1. Accusing someone of faults that one has oneself, as in Tom's criticizing Dexter for dubious line calls is a case of the pot calling the kettle black, since Tom's about the worst line judge I've ever seen. This expression dates from the days of open-hearth cooking, which blackens practically all the utensils used. [Early 1600s]

---