《旧唐书·列传·卷四》
武德二年，宇文化及在魏县僭越称帝，窦建德对他的纳言宋正本、内史侍郎孔德绍说 ：我当隋朝的百姓几十年了，隋朝当我的君主有两代了。
二年，宇文化及僭号于魏县，建德谓其纳言宋正本、内史侍郎孔德绍曰： 吾为隋之百姓数十年矣，隋为吾君二代矣。
In the second year of Wude, Yuwen Huaji claimed the title of emperor in Weixian. Dou Jiande said to his Minister of Advice, Song Zhengben and Minister of Internal History, Kong Deshao: I have been a subject of the Sui Dynasty for decades, and it has been my sovereign for two generations. 