《左传·襄公·襄公二十四年》
脱险以后，张、辅二人又蹲在车后边横木上弹琴，说： 公孙！
既免，复踞转而鼓琴，曰： 公孙！
After they were removed from danger, Zhang and Fu crouched once again behind the crossbeam of the chariot and played the zither. They said: "Gonsun!"