《三国志·吴书·程黄韩蒋周陈董甘淩徐》
甘宁当时有兵三百人，就说： 能否再给我增添五百人，我前去对付他，保证关羽一听到我咳唾之声，就不敢渡河，如他渡河就被我擒获。 鲁肃便择选一千人增添甘宁部队，甘宁就连夜赶往资水上游。
宁时有三百兵，乃曰： 可复以五百人益吾，吾往对之，保羽闻吾欬唾，不敢涉水，涉水即是吾禽。 肃便选千兵益宁，宁乃夜往。
Gan Ning had 300 soldiers at the time, so he said: Can you give me 500 more soldiers, I will go to deal with him, I guarantee that Guan Yu will not dare to cross the river as soon as he hears my cough, and if he cross the river I will capture him. Lu Su chose a thousand people to add to Gan Ning's troops, and Ganning rushed to the upper reaches of the Zishui River overnight.