《魏书·列传·卷十六》
世祖在昼空打败蠕蠕大檀于，刘洁对世担说： 太檀仗恃人多，虽然逃跑，恐怕不畏惧往日的失败，还要前来送死。
世祖破蠕蠕大檀于云中。洁言于世祖曰： 大檀恃众，虽破胆奔北，恐不惧往败，将复送死。
Shizu defeated the Grand Khan of the Rouran in the daytime, and Liu Jie said to Shizu: "The Grand Khan relies on his great number of men. Although he has fled, I am afraid that, without fear of the past defeat, he might come back to fight a losing battle."