既往不咎

Explanation: Originally referred to or done has been done, no longer blaming. Refers to past mistakes are not to blame. 　　Usage: The main predicate; as the predicate attribute; that no blame for past mistakes 　　Source: Pre Confucius "The Analects of Confucius eight-yi": "disposes not say, then do not bridge, and let bygones be bygones." 　　Examples: ~, Later arranges carefully point it wants to. (Qing Wu Jian "pain history" XIII back) Thesaurus:  give quarter, lenity, Extrajudicial Ren, Fawai favor, past not censure