《明史·列传·卷五十五》
成祖在北京，有人上奏南京纸币制度被豪强破坏，皇帝派墉堃查访，众人都以为将要大肆逮捕，郦堃逮捕一两个街市豪强回京，上奏说： 市人听到命令很害怕，纸币制度通行了。 
成祖在北京，或奏南京钞法为豪民沮坏，帝遣埜廉视。众谓将起大狱，埜执一二市豪归。奏曰： 市人闻令震惧，钞法通矣。 
When Emperor Chengzu was in Beijing, some people reported that the Nanjing paper money system had been undermined by the powerful and wealthy. The emperor sent Song Kun to investigate. Everyone thought there would be a lot of arrests. Song Kun arrested one or two street tycoons and returned to Beijing to report that the citizens were frightened by the order, and the paper money system had been implemented.