《左传·昭公·昭公十年》
过去庆封逃亡，子尾接受城邑之后，又稍稍奉还给国君一部分，国君认为他忠诚，因而很宠信他。
昔庆封亡，子尾多受邑而稍致诸君，君以为忠而甚宠之。
In the past, Qingfeng fled, and after Zimei accepted the city, he returned a small part to the monarch, and the monarch believed that he was loyal, so he trusted him very much.