《左传·定公·定公八年》
准备放回乐祁，士鞅说： 扣留了他三年，无缘无故又把他放回去，宋国必然背叛晋国。 
将归乐祁。士鞅曰： 三年止之，无故而归之，宋必叛晋。 
Prepare to release Le Qi, Shi Yang said: Detained him for three years, and released him for no reason, the State of Song will inevitably betray the State of Jin.