《魏书·列传·卷八十二》
刘腾又使中常侍贾粲假借侍奉肃宗书案，暗中令其监视肃宗行迹。
又使中常侍贾粲假言侍肃宗书，密令防察。
Liu Teng also had the Zhongchangshi (imperial attendant) Jia Can pretend to serve Emperor Su's desk and secretly monitor Emperor Su's actions.