《资治通鉴·唐纪·唐纪五十二》
李师古打算趁着国家大丧事侵吞相邻州道的辖地，便集合将士，对他们说： 圣上福缘无疆，李元素却忽然传布遗诏，这是造反啊，应当向他出击。 
师古欲乘国丧侵噬邻境，乃集将士谓曰： 圣上万福，而元素忽传遗诏，是反也，宜击之。 
Li Shigu planned to annex the neighboring state territories during the national mourning, so he assembled his generals and soldiers and said to them: The saint has boundless blessings, but Li Yuansu suddenly spread the will, which is a rebellion and should be attacked.