《新唐书·列传·卷一百三十二》
那时，崔慎由任翰林学士，值班到半夜时，有中使来召他入内，到了秘殿，见仇士良等人坐在堂上，帷帐遮得严严密密。仇士良对崔慎由说 ：皇上病了已很久了。自从他即位以来，政令多荒缺。皇太后有制，要改立嗣君，你是学士应当写诏书。 
崔慎由为翰林学士，直夜未半，有中使召入，至秘殿，见士良等坐堂上，帷帐周密，谓慎由曰： 上不豫已久，自即位，政令多荒阙，皇太后有制更立嗣君，学士当作诏。 
Then, Cui Shenyou worked as a Bachelor of Hanlin and took night shifts. One day, a chamberlain summoned him inside. When Cui Shenyou entered the secluded palace, he saw Chou Shliang and others sitting in the hall and the curtains were tightly closed. Chou Shliang said to Cui Shenyou, "The emperor has been sick for a long time. Since his reign, there are many flaws in his decrees. The empress dowager has an edict to appoint a new heir to the throne. As a bachelor, you should write the edict. 