《后汉书·本纪·肃宗孝章帝纪》
二月壬寅，对常山、魏郡、清和、巨鹿、东平郡太守说： 我想到巡视的制度，是用以宣传教化，考察远近，解释怨结。
二月壬寅，告常山、魏郡、清河、巨鹿、平原、东平郡太守、相曰： 朕惟巡狩之制，以宣声教，考同遐迩，解释怨结也。
On Renyin day in February, Emperor Zhang said to the prefects of Changshan, Weijun, Qinghe, Julu, and Dongping: I think that the system of inspection tours can be used to spread education, research and assess distant and nearby areas, and explain grievances. 