《资治通鉴·宋纪·宋纪十六》
从前，每逢夜晚，刘昱闯出闯进，都急躁凶暴，守门卫土震恐，从不敢抬头。所以，今晚之事，没有一人怀疑。
他夕，苍梧王每开门，门者震慑，不敢仰视，至是弗之疑。
In the past, whenever Liu Yu rushed in and out at night, he would be irritable and ferocious, and the guards would be terrified and never dared to look up. Therefore, no one doubted what happened tonight.