《史记·七十列传·张仪列传》
如今，假如大王不奉事秦国，秦国将出动武装部队直下云中、九原，驱使赵国进攻燕国，那么易水、长城，就不再为大王所拥有了。
今大王不事秦，秦下甲云中、九原，驱赵而攻燕，则易水、长城非大王之有也。
Today, if your Majesty doesn't serve Qin, Qin will send troops to attack directly to Yunzhong and Jiuyuan, and order Zhao to attack Yan. In such a case, Yishui and the Great Wall will no longer belong to your Majesty.