《后汉书·本纪·光武帝纪下》
刺史、二千石长吏都不要离开自己所在的城邑，不要派官员或通过驿传邮寄唁函吊唁。 
刺史、二千石长吏皆无离城郭，无遣吏及因邮奏。 
The governor, the two thousand stone magistrate, and all must not leave their own cities, and no officials or驿传 should be sent to mourn.