《史记·七十列传·廉颇蔺相如列传》
秦国向赵王的宠臣郭开贿赂很多金钱，让他施行反间计，造谣说李牧、司马尚要谋反。
秦多与赵王宠臣郭开金，为反间，言李牧、司马尚欲反。
The Qin bribed Zhao’s favorite minister Guo Kai, to carry out a counter-espionage strategy, spreading rumors that Li Mu and Sima Shang were planning a rebellion.