《北史·列传·卷九》
当大军围困代郡时，昭成帝对城里人说 ：燕凤再不肯前来的话，我准备让兵士们屠城。 
及军围代，谓城人曰： 凤不来者，将屠之。 
When the army besieged Daiguo, Emperor Zhaocheng said to the people in the city: If Yan Feng refuses to come again, I will let the soldiers massacre the city.