《左传·僖公·僖公二十四年》
郑文公听从皇武子的话，设享礼招待宋公，比常礼有所增加。这是合于礼的。
郑伯从之，享宋公有加，礼也。
Duke Wen of Zheng followed Huang Wuzi's words and, when he received the Cheng of Song, added some things to the normal ceremonies. This was in accordance with the code of rites.