《资治通鉴·唐纪·唐纪三十七》
于是命令左右的人去把郝廷玉的头颅割下来。郝廷玉说： 是我的坐骑中箭，并不是我怯战退了下来。 
命左右取廷玉首，廷玉曰： 马中箭，非敢退也。 
So he ordered his men to cut off Hao Tingyu's head. Hao Tingyu said: "My horse was shot with an arrow. I did not retreat because I was afraid of the battle."