calling the kettle black 锅嫌壶黑（五十步笑百步）

The phrase "the pot calling the kettle black" is an idiom used to accuse another speaker of hypocrisy,in that the speaker disparages the subject for a fault or negative behavior that could equally be applied to him or her,though there is an alternative interpretation.In former times cast iron pots and kettles were quickly blackened from the soot of the fire.The pot would then be hypocritical to insult the kettle's colour,since both are black with soot.
中国的五十步笑百步：Soldier who fled off the battle fifty steps afar laughs at those a hundred steps afar.