《汉书·志·五行志下之下》
这以后国内不自己端正行为，而对外则扣押了陈国大夫，这样陈、楚就不归顺，郑伯逃脱结盟，诸侯将不听从齐桓公的政令，所以上天现出警戒。
其后不内自正，而外执陈大夫，则陈、楚不附，郑伯逃盟，诸侯将不从桓政，故天见戒。
After this, the state internally failed to rectify its conduct, abducted the magistrate of Chen, such that Chen and Chu refused to surrender, Duke Zheng escaped the alliance, and the feudal lords refused to obey the orders of Duke Huan of Qi and therefore heaven manifested a warning.