《资治通鉴·唐纪·唐纪二十七》
姚崇和卢怀慎向玄宗进谏道： 臣等在此之前曾得到陛下的旨意，说凡王公、驸马有所奏请，如果没有陛下亲笔书写的墨敕，均不能生效。
姚崇、卢怀慎上言： 先尝得旨，云王公、驸马有所奏请，非墨敕皆勿行。
Yao Chong and Lu Huaishen remonstrated with Emperor Xuanzong: Before this, we have received an imperial decree from Your Majesty, stating that if the kings and princes, and the imperial sons-in-law have any requests to make, their requests shall not be approved unless they are presented with ink edicts written in Your Majesty's own hand.