《资治通鉴·汉纪·汉纪五十二》
刘虞几次请他会商，他都称病不肯前往。刘虞担心他终将叛乱，于是率领部下合计十万大军，计伐公孙瓒。
虞数请会，瓚辄称病不应；虞恐其终为乱，乃率所部兵合十万人以讨之。
Liu Yu asked him to meet him several times, but he claimed to be ill and refused to go. Liu Yu was worried that he would eventually rebel, so he led his troops of more than 100,000 troops to plan and attack Gongsun Zan.