《史记·三十世家·宋微子世家》
三十年，曹国背弃了与宋国的盟约，又背弃了与晋国的盟约，宋国于是讨伐曹国，晋国未去救援，于是宋国灭掉了曹国，占据了曹国国土。
三十年，曹倍宋，又倍晋，宋伐曹，晋不救，遂灭曹有之。
In the thirtieth year, the State of Cao breached the covenant with the State of Song again, breached the covenant with the State of Jin, therefore the State of Song attacked the State of Cao, the State of Jin did not rescue it, so the State of Song destroyed the State of Cao, and seized the territory of the State of Cao.