《左传·昭公·昭公十二年》
晋昭公设享礼招待诸侯，子产辅佐郑定公，请求不参加享礼，请求丧服期满然后听取命令。
晋侯享诸侯，子产相郑伯，辞于享，请免丧而后听命。
Duke Zhao of Jin set up a feast to entertain the feudal lords. Zichan assisted Duke Ding of Zheng and asked to not participate in the feast, asking to wait until his mourning period ended before he would accept orders.