《旧唐书·本纪·卷二》
二十二日，太宗率领所有禁军步骑将领在显德殿殿廷学习射箭，对将军及其以下的官员说： 从古以来，突厥与中国互有盛衰。
丁未，引诸卫骑兵统将等习射于显德殿庭，谓将军已下曰： 自古突厥与中国更有盛衰。
On the 22nd, Emperor Taizong led all the generals of the Imperial Guards on foot and horseback to the Xi'ande Hall to practice archery. He said to the generals and their subordinates: Since ancient times, the Turks and China have had their ups and downs.