《资治通鉴·唐纪·唐纪五十二》
乙亥，德宗颁诏说： 从今以后，不要让公卿与众臣僚在正殿奏陈事情，如果需要奏陈，应当到延英门去请求召问对答。 
乙亥，诏 公卿庶僚自今勿令正牙奏事，如有陈秦，宜延英门请对。 
On the yihai day, Emperor Dezong issued an edict, saying: From now on, do not let the public servants and ministers play the things in the main hall, if we need to report, we should go to the Delaying Ying Gate to request a question and answer.