《史记·十二本纪·秦本纪》
二十七年，秦景公到了晋国，与晋平公订立盟约，不久就背叛了盟约。
二十七年，景公如晋，与平公盟，已而背之。
In the 27th year, Duke Jing of Qin came to the state of Jin and signed an alliance with Duke Ping of Jin, but soon betrayed the alliance.