《资治通鉴·晋纪·晋纪三十三》
那时，拓跋围困中山城很长时间也没有攻克，部队的粮食非常缺乏，向群臣询问办法，当时崔逞是御史中丞，他回答说： 桑椹可以用来做辅助粮食。
珪围中山，久未下，军食乏，问计于群臣。逞为御史中丞，对曰： 桑椹可以佐粮。
At that time, Tuoba besieged Zhongshan City for a long time but was not able to capture it, his army was greatly lacking food, and asked his courtiers for a solution. At that time, Cui Cheng was the Censor in Chief, and he replied: Mulberries can be used as supplementary food.