《北史·列传·卷三十二》
永平元年秋，朝廷将诛杀元愉的妾李氏，群臣没有人敢替她求情的，朝廷命崔光起草诛杀李氏的诏书，他犹豫很久没有动笔，奏报朝廷说： 我听说要处决元愉的妾李氏，她妖言惑众，煽乱人心，实在应该杀戮。
敕光为诏，光逡巡不作，奏曰： 伏闻当刑元愉妾李，加之屠割。妖惑扇乱，诚合此罪。
In the autumn of the first year of Yongping, the court was going to execute Yuan Yu's concubine Li, and none of the officials dared to plead for clemency for her. The court ordered Cui Guang to draft an edict to execute Li, and he hesitated for a long time before picking up his writing brush, and reported to the court that: I heard that Yuan Yu's concubine Li was being executed because of bewitching people and causing unrest, and that she should indeed be killed.