《旧唐书·列传·卷三十六》
当时正遇大旱，关中饥乏，太子下令取廊下兵士粮食，见有的吃的是榆皮蓬实，于是命令主管仓谷饮食的太子家令发足廊下士卒的粮食。
时属大旱，关中饥乏，令取廓下兵士粮视之，见有食榆皮蓬实者，乃令家令等各给米使足。
At that time, there was a severe drought, and the Guanzhong region was suffering from famine. The crown prince commanded to take food from the soldiers on the verandah, and he saw that some were eating elm bark and acorns, so he commanded the crown prince's steward in charge of granary, food, and drink to give out food to those on the verandah.