Clean hands

hands that are not dirty; clear conscience (Slang)

Unclean hands, sometimes clean hands doctrine, is an equitable defense in which the defendant argues that the plaintiff is not entitled to obtain an equitable remedy on account of the fact that the plaintiff is acting unethically or has acted in bad faith with respect to the subject of the complaint—that is, with "unclean hands." The defendant has the  burden of proof to show the plaintiff is not acting in good faith. The doctrine is often stated as "those seeking equity must do equity" or "equity must come with clean hands".
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A maxim of the law to the effect that any person, individual or corporate, that wishes to ask or petition a court for judicial action, must be in a position free of fraud or other unfair conduct. - (read more on Clean hands)