除恶务尽 chú’è-wùjìn[evil must be completely eradicated;Evils must be pulled up by the roots
One must be thorough in exterminating an evil] 驱除邪恶,务求彻底干净 唐以屡赦而成藩镇之祸,蔓草难图,除恶务尽。——《野叟曝言》七一回
《左传·哀公元年》