不咎既往 Let bygones be bygones
Explanation
不咎既往，指不追究过去的过错。通常用于宽容待人，或表示对过去错误的谅解。
Not blaming the past means not pursuing past mistakes. It is usually used to be tolerant of others, or to show understanding of past mistakes.
Origin Story
话说唐朝时期，一位名叫李白的诗人，因卷入政治斗争而被流放。流放途中，他多次触犯法令，但他才华横溢，深受皇帝赏识。皇帝深知他本性善良，一时糊涂，最终下旨赦免了他，不咎既往。李白得以重回朝廷，继续他的诗歌创作，为唐朝文化增添了浓墨重彩的一笔。
During the Tang Dynasty, a poet named Li Bai was exiled because of his involvement in political struggles. During his exile, he repeatedly violated the law. However, his talent was outstanding, and he was highly appreciated by the emperor. The emperor knew that he was inherently kind and had made a momentary mistake. Finally, he issued an edict to pardon him and not blame the past. Li Bai was able to return to the court and continue his poetic creation, adding a rich and colorful stroke to the Tang Dynasty culture.
Usage
用于宽恕别人的过错，不再追究。常用于处理矛盾和纠纷。
Used to forgive someone's mistakes and not pursue them any further. Often used to resolve conflicts and disputes.
Examples
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他犯了错，但考虑到他过去的贡献，我们决定不咎既往。
ta fanle cuo, dan kaolǜ ta guoqù de gongxian, women jueding bujiù jiwang.
He made a mistake, but considering his past contributions, we decided to let bygones be bygones.
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这次的失误虽然严重，但鉴于他以往的良好表现，公司决定不咎既往。
zheci de shiwu suīrán yánzhòng, dàn jiànyú tā yǐwáng de liánghǎo biǎoxiàn, gōngsī juédìng bùjiù jiwang.
Although the mistake was serious, considering his past good performance, the company decided to let bygones be bygones.