《左传·昭公·昭公四年》
宋国的左师、郑国的子产在这里，他们是诸侯大夫中的能干人物，君王可以加以挑选。 
宋向戌、郑公孙侨在，诸侯之良也，君其选焉。 
Zuo Shi from the State of Song and Zichan from the State of Zheng are here. They are capable figures among the feudal lords. The king can select them. 