《旧五代史·后周·太祖纪四》
夏四月五日，禁止边境一带的人将兵器卖给蕃族人。赐给朗州刘言绢布三百匹，是因为军费匮乏的缘故。
赐朗州刘言绢三百匹，以兵革之后匮乏故也。
On the 5th day of the fourth month of summer, people from border areas were prohibited from selling weapons to minorities. Liu Yan of Langzhou was awarded 300 pieces of silk cloth because of a shortage of military funds.