《资治通鉴·唐纪·唐纪六十七》
冬季，十月，甲子，庞勋的使者来到彭城，崔彦曾将他逮捕并严加审问，将庞勋的反状全部搞清，于是囚禁使者。
冬，十月，甲子，使者至彭城，彦曾执而讯之，具得其情。乃囚之。
In the winter, October, Jia Zi, Pang Xun’s messengers arrived in Pengcheng, Cui Yan Zeng arrested him and severely interrogated him, fully investigated Pang Xun’s rebellion, and arrested the messengers.