《左传·昭公·昭公元年》
夏季，四月，赵孟、叔孙豹、曹国的大夫进入郑国，郑简公同时设享礼招待他们。
夏四月，赵孟、叔孙豹、曹大夫入于郑，郑伯兼享之。
In the fourth month of summer, Zhao Meng, Shusun Biao, and the minister of Cao entered the State of Zheng. Duke Jian of Zheng prepared a banquet to entertain them at the same time.