《资治通鉴·唐纪·唐纪十九》
唐高宗因关中地区发生饥荒，米价每斗涨至三百钱，准备前往东都洛阳；丙寅，从京师长安出发，留太子监理国家政事，让刘仁轨、裴炎、薛元超辅佐他。
上以关中饥馑，米斗三百，将幸东都；丙寅，发京师，留太子监国，使刘仁轨、裴炎、薛元超辅之。
Tang Gaozong, as there was a famine in the Guanzhong Region, and the price of rice per 10 liters rose to 300 coins, prepared to go to the eastern capital Luoyang. On the day Bingyin, he set off from the capital Chang'an. He left the crown prince to supervise state affairs, and Liu Rengui, Pei Yan, and Xue Yuanchao to assist the prince.