《左传·成公·成公五年》
冬季，鲁成公和晋景公、齐顷公、宋共公、卫定公、郑悼公、曹宣公、邾子、杞桓公在虫牢结盟，这是由于郑国顺服。诸侯商量再次会见，宋共公派向为人以子灵事件为理由而辞谢了，不参加会见。
冬，同盟于虫牢，郑服也。诸侯谋复会，宋公使向为人辞以子灵之难。
In the winter, Duke Cheng of Lu, Duke Jing of Jin, Duke Qing of Qi, Duke Gong of Song, Duke Ding of Wei, Duke Dao of Zheng, Duke Xuan of Cao, the Zhuzi, and Duke Huan of Qi formed an alliance in Chonglao, due to the submission of the state of Zheng. The vassal states discussed meeting again, and Duke Gong of Song sent Xiang Wei to give the Zi Ling incident as an excuse for declining, unwilling to attend the meeting.