《史记·三十世家·郑世家》
二年，晋国讨伐郑国，郑国与晋国结为盟好，晋国才离去。
二年，晋伐郑，郑与盟，晋去。
In the second year, the State of Jin attacked the State of Zheng, and the State of Zheng formed an alliance with the State of Jin, so the State of Jin left.