《左传·昭公·昭公十六年》
韩宣子向郑定公请求得到那只玉环，子产不给，说： 这不是公家府库中保管的器物，寡君不知道。 
宣子谒诸郑伯，子产弗与，曰： 非官府之守器也，寡君不知。 
Xunxuanzi asked Zheng Dinggong for the ring, but Zichan didn't give it to him, saying: "This is not an utensil kept in the public treasury or government office, my lord does not know about it."