《隋书·列传·卷二十四》
杨侗还认为他很忠诚，让他上殿，世充披发为盟，发誓没有二心。
侗以为至诚，命之上殿，被发为盟，誓无贰志。
Yang Dong still thought he was loyal and asked him to attend the court, Shichong shaved his hair as an alliance, vowing that he was not two-faced.