《容斋随笔·卷十二·古人重国体》
于是就杀了那个使者等到楚子围攻宋国已经很危急的时候，宋国华元仍然说： 兵临城下被迫订立的盟约，会使国家灭亡，不能听从。 
乃杀之。及楚子围宋既急，犹曰： 城下之盟，有以国毙，不能从也。 
Thus they killed the ambassador. By the time the Duke of Chu besieged Song very dangerously, Hua Yuan of Song still said: Alliance made under the siege of the city will lead to the destruction of the country, it cannot be followed.