《汉书·纪·昭帝纪》
燕王派寿西长、孙纵之等贿赂长公主，丁外人、谒者杜延年、大将军长史公孙遗等，传递密书，共同策划让长公主设酒宴请大将军霍光，乘机用伏兵将其杀死。随后征立燕王为天子，实为大逆不道。
燕王遣寿西长、孙纵之等赂遗长公主、丁外人、谒者杜延年、大将军长史公孙遗等，交通私书，共谋令长公主置酒，伏兵杀大将军光，征立燕王为天子，大逆毋道。
King Yan sent people like Shouxi Chang and Sun Zhongzhi to bribe the Princess of Eyi, Ding Wai, Grand Chamberlain of Ceremonies Du Yinian, and Chief Clerk of the General-in-Chief, Gongsun Yi, with money and pass on secret letters. They planned together to have the Princess of Eyi hold a banquet inviting the general-in-chief, and to seize the opportunity to kill him with an ambush. They would then establish King Yan as emperor – a truly treasonous act.