《明史·志·卷五十》
然而在二十五年，命聂庆童前往河州敕谕茶马之事，宦官奉旨出使办事已从这时开始。
然二十五年命聂庆童往河州敕谕茶马，中官奉使行事已自此始。
However, in the twenty-fifth year, Nie Qingtong was ordered to go to Hezhou to give an edict on the issue of the tea-horse trade, thus starting the trend of eunuchs carrying out diplomatic assignments.