《资治通鉴·宋纪·宋纪七》
于是，刘骏派张畅打开城门出去跟李孝老伯见面，张畅对李考伯说： 安北将军向魏主表示问候，并一直希望能会面，只因为身为臣属，不能随便与境以外的人建立交情，所以，很遗憾暂时不能抽出时间来见面。
骏使张畅开门出见之，曰： 安北致意魏主，常迟面写，但以人臣无境外之交，恨不暂悉。
So, Liu Jun sent Zhang Chang to open the city gate and go out to meet Li Xiaobo. Zhang Chang said to Li Xiaobo: General Anbei sends his greetings to the Lord of Wei and has always hoped to meet you. However, as a subject, he cannot establish relationships with people from outside his own country, so regrettably he cannot make time to meet you now.