《韩非子·八经》
君主和臣下约定，要他们告发上级：针对相国，就和廷臣约定；针对廷臣，就和他属下的官吏约定；针对军吏，就和兵士约定；针对派遣的使者，就和他的随从人员约定；针对县令，就和他任命的属吏约定；针对郎中，就和他的侍从约定；针对后姬，就和宫女约定。
下约以侵其上：相室，约其廷臣；廷臣，约其官属；兵士，约其军吏；遣使，约其行介；县令，约其辟吏；郎中，约其左右；后姬，约其宫媛。
The monarch and the subject make an agreement to ask them to report the superiors: regarding the Prime Minister, make an agreement with the imperial court minister; regarding the imperial court minister, make an agreement with his subordinate officials; regarding the military officer, make an agreement with the soldiers; regarding the dispatched envoy, make an agreement with his entourage; regarding the county magistrate, make an agreement with his appointed subordinates; regarding the young official, make an agreement with his attendant; regarding the concubines, make an agreement with the maids-in-waiting.