《辽史·列传·卷十六》
刘景上奏说： 按唐制，赦书每天要走五百里，现在延期不发诏，是不对的。 
景奏曰： 唐制，赦书日行五百里，今稽期弗发，非也。 
Liu Jing reported to the throne that: According to the Tang system, the edict of amnesty should be sent out every 500 li every day, but now it has been delayed and not sent out, which is inappropriate.