《新唐书·列传·卷一》
国忠入告贵妃，贵妃口衔土块请死，玄宗之意受阻，才中止这样做。
国忠入白妃，妃衔塊请死，帝意沮，乃止。
Guozhong went and told the Imperial Consort, and the Imperial Consort took a piece of earth in her mouth and begged for her life, and so Emperor Xuanzong was unable to achieve his aim and was forced to stop.