《旧唐书·列传·卷七十八》
天宝七年，高仙芝接替马灵察，派兵包围怛罗斯城，大食国救兵到，高仙芝大败，兵将失散，夜晚段秀实听见李嗣业的声音，就高喊道： 兵败逃命，不是大丈夫。 
七载，高仙芝代灵察，举兵围怛逻斯，黑衣救至，仙芝大衄，军士相失。夜中闻都将李嗣业之声，因大呼责之曰： 军败而求免，非丈夫也。 
In the seventh year of Tianbao, Gao Xianzhi succeeded Ma Lingcha and sent troops to lay seige to the city of Talas. Soldiers of the Abbasid Caliphate came to the rescue. Gao Xianzhi suffered a heavy defeat, his troops dispersed. At night Duan Xiushi heard the voice of Li Siye and shouted: “A soldier who flees for life is not a man!”