《贞观政要·卷三·论择官》
在贞观初年，没有任命尚书令和左右仆射，当时尚书省里公务繁杂，比今天成倍地多，左丞戴胄、右丞魏徵，都办事熟练，公平正直，事情有问题就予以指责，从不回避。陛下对他们又信任爱护，自然能整肃纲纪。
贞观之初，未有令、仆，于时省务繁杂，倍多于今。而左丞戴胄、右丞魏征并晓达吏方，质性平直，事应弹举，无所回避，陛下又假以恩慈，自然肃物。
In the early years of Zhenguan, Shangshu Ling and Zuo and You Pushe were not appointed. At that time, the official duties of Shangshu Province were more complicated, and they were several times more than today. Zuo Cheng Dai Zhou and You Cheng Wei Zheng were both skilled in handling affairs, fair and upright, and criticized when there were problems with the matter, and never avoided it. His Majesty trusted and loved them, so naturally he could rectify the discipline.