《资治通鉴·晋纪·晋纪十六》
后赵国主石勒以邮驿传书的形式敕告郭敬后退屯军樊城，让他将旗帜收卷藏起，寂静如同无人。石勒说： 他们如果派人观察，便告诉他说： 你应当自我珍爱坚固防守，再过七八天，骑兵大军就将到达，和我们相互策应，你们再也逃不掉了。  
赵主勒以驿书敕敬退屯樊城，使之偃藏旗帜，寂若无人，曰： 彼若使人观察，则告之曰： 汝宜自爱坚守，后七八日，大骑将至，相策，不复得走矣。  
The lord of the Later Zhao, Shi Le, decreed by mail that Guo Jing should withdraw and be stationed at Fancheng, let him furl up and hide the banners, and stay silent as if there was no one there. Shi Le said: If they send someone to investigate, tell them: You should cherish and defend yourself. In another seven or eight days, the army of cavalry will arrive, and we will work together, and you will not be able to escape.