《资治通鉴·魏纪·魏纪四》
鲜卑首领轲比能引诱保塞鲜卑首领步度根与他深交和睦，亲自率领一万骑兵在陉北迎接步度根的人马辎重，荆州刺史毕轨上表请求马上出兵，对外威胁柯比能，对内镇压步度根。
鲜卑轲比能诱保塞鲜卑步度根与深结和亲，自勒万骑迎其累重于陉北。并州刺史毕轨表辄出军，以外威比能，内镇步度根。
Xianbei leader Kebi trapped Xianbei leader Budygen into having a close friendship with him. He personally led 10,000 cavalry troops north of Heng to welcome Budygen's troops and supplies, and Jingzhou Governor Bi Gui suggested to send out troops to threaten Kebi and suppress Budygen within the country.