《辽史·列传·卷十八》
到这时，高丽进贡不再按时送到，皇上诏令资忠回来。前往责问其缘故。
至是，贡献不时至，诏资忠往问故。
By this time, Goryeo's tributes were no longer being delivered on time, and the emperor ordered Weizhong to return to Goryeo to demand an explanation.