北宋真宗年间,为了奖励耕织,朝廷颁发了一项十分严厉的政策规定:凡私自宰杀耕牛者,判死刑。这一天,农夫王老实到县令包拯处报案,说自家耕牛的舌头不知被谁给割去了。包拯接到报案后就进行了认真的心理联想:牛是靠舌头卷食草料的,舌头被割,牛即不能吃草料;日久不吃草料,牛必饿死;牛死,主人舍不得把一头牛扔掉,必会宰牛卖肉或自己食用; Emperor Zhenzong years, in order to reward farming and weaving, the court issued a very strict policy: where slaughtered cattle slaughtered personally sentenced to death. On this day, the farmer king honestly reported to the county magistrate Bao Zheng, saying that the tongue of his cattle did not know who was cut off. Bao Zheng received a report after a serious psychological association: cattle rely on the tongue roll feed forage, the tongue is cut, the cattle that can not eat fodder; as time does not eat grass, cattle will starve to death; cattle dead, the owner could not bear to put A cow thrown away, will slaughter cattle to sell meat or their own consumption;