《辽史·列传·卷二》
皇上马上改正了。授他为西南面招讨使，命令他到河南索讨吐蕃民户，渐渐得到提升和任用。
厥后嗣君，虽严法以绳之，卒不可止。
The emperor immediately corrected the letter. He appointed Xi as the Recruiting and Punitive Envoy for the Southwest, and ordered him to go to Henan to solicit Tibetan households. Gradually, Xi was promoted and employed.