Clean hands
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
It is a rule of equity that a plaintiff must come with "clean hands," i. e., he must be free from reproach in his conduct. But there is this limitation to the rule: that his conduct can only be excepted to in respect to the subject-matter of his claim ; everything else is immaterial.
American Ass'n v. Innis, 109 Ky. 595, 60 S. W. 388.