秋毫无犯 not violate even a single hair
Explanation
秋毫指的是鸟兽秋天新长的细毛，比喻非常微小的事物。秋毫无犯指的是军队纪律严明，不侵犯百姓的利益，即使是最微小的东西也不触犯。
Qiūháo refers to the fine hair of birds and animals that grows in autumn, and is a metaphor for very small things. Qiūháo wú fàn means that the army is strictly disciplined and does not violate the interests of the people, even the smallest things are not violated.
Origin Story
汉高祖刘邦在与项羽争夺天下的过程中，始终保持着军纪严明，秋毫无犯。他不仅禁止士兵抢掠百姓，还命令士兵爱护百姓的财产，甚至连一根头发丝都不允许伤害。汉高祖刘邦的这种仁义之举，赢得了百姓的拥护，最终取得了天下。
During the struggle for the throne between Han Gaozu Liu Bang and Xiang Yu, Han Gaozu Liu Bang always maintained strict military discipline and did not violate the people. He not only prohibited soldiers from looting the people, but also ordered the soldiers to protect the property of the people, and even a single hair was not allowed to be harmed. This act of benevolence of Han Gaozu Liu Bang won the support of the people and eventually gained the throne.
Usage
这个成语一般用于形容军纪严明，不侵犯百姓的利益。
This idiom is generally used to describe strict military discipline that does not violate the interests of the people.
Examples
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秦朝统一六国后，在全国范围内推行法令，以巩固其统治，对于民众秋毫无犯，获得了普遍的拥护。
qín cháo tǒng yī liù guó hòu, zài quán guó fàn wéi tuī xíng fǎ lìng, yǐ gòng gù qí tǒng zhì, duì yú mín zhòng qiū háo wú fàn, huò dé le pǔ biàn de yōng hù.
After the Qin Dynasty unified the six kingdoms, it implemented laws nationwide to consolidate its rule. It did not violate the people at all, which won widespread support.
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这支军队军纪严明，秋毫无犯，百姓们都很欢迎他们。
zhè zhī jūn duì jūn jì yán míng, qiū háo wú fàn, bǎi xìng men dōu hěn huānyíng tā men.
This army is well disciplined, and they don't violate the people at all. The people welcome them.