既往不咎 [- - bú jiù]Let bygones be bygones.; forgive somebody's past misdeeds; It is needless to blame things that are past.; let the past be forgotten; be let off for one's past misdeeds; Let the dead bury their dead.; not to censure sb. for his past misdeeds (亦作“不咎既往”):
•¶ 过去的事情既往不咎，以后你可得注意。 We'll overlook what you've done in the past but you'd better watch out in the future.