《元史·列传·卷六十三》
八番帅擅自杀人，引起边境事端，朝廷派人代替了他，并命伯启追查此事。
八番帅擅杀，起边衅，朝廷已用帅代之矣，命伯启往诘其事。
The commander of the Eight Banners killed people on his own, causing border incidents. The imperial court sent someone to replace him and ordered Boqi to investigate the matter.