《太平广记·卷七十一·道术一》
窦玄德是河南人，贞观年间任都水使者，当时他五十七岁，奉命出使江西。
窦玄德，河南人也。贞观中，任都水使者，时年五十七，奉使江西。
Dou Xu'de was a native of Henan Province, and he was 57 years old during the Zhenguan reign period. He was under orders to go on a mission to Jiangxi at the time.