《新唐书·列传·卷七十九》
但张孝忠的部队夹在两支叛军之间，李晟的部队是他的重要依靠，多次劝阻李晟不要向西进兵，李晟对大家说： 皇帝流亡，臣子当百死一生去救驾，义武想阻止我，我准备留下儿子做人质。 
而孝忠以军介二盗间，倚晟为重，数止晟无西。晟语众曰： 天子播越，人臣当百舍一息。义武欲止吾，吾当以子为质。 
However, Zhang Xiaozhong's troops were caught between the two rebel armies. Li Sheng's troops were his important reliance. He repeatedly dissuaded Li Sheng from advancing westward. Li Sheng said to everyone: The emperor is in exile, and his subjects should die a hundred times to save him. Yi Wu wanted to stop me. I was ready to leave my son as a hostage.