《左传·成公·成公十五年》
楚国准备向北方出兵，子囊说： 新近和晋国结盟而背弃它，恐怕不可吧！ 
楚将北师。子囊曰： 新与晋盟而背之，无乃不可乎？ 
The State of Chu was preparing to send troops north, and Zixiang said, "We have only recently made alliances with Jin and now we will break them. Isn't that unwise?"