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During the Warring States period, Lord Mengchang of Qi did not punish a retainer who had fallen in love with his concubine. Instead, he prepared many gifts for him and recommended him to the ruler of the State of Wei, saying, 'We are friends from our humble days, and I hope Wei can offer you a great future.'
Later, when Wei planned to unite with other feudal lords to attack Qi, that retainer strongly advised against it, thus preventing a war.

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Open the tool →布衣之交 (bù yī zhī jiāo) is a Chinese idiom (chengyu) meaning “Friends made in one's humble or commoner days”.
布衣之交 is pronounced bù yī zhī jiāo in Mandarin Chinese.
Literally, 布衣之交 means “Commoner's friendship”. It is used to mean “Friends made in one's humble or commoner days”.
布衣之交 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
布衣:平民。旧指贫寒老友。