《北史·列传·卷二》
起初，宣帝有病，下诏让隋文帝入宫侍候皇帝治病。
初，宣帝不豫，诏隋文帝入禁中侍疾。
At first, when Emperor Xuan was ill, he issued a decree for Emperor Wen of Sui to enter the palace to serve the emperor's illness.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 初，宣帝不豫，诏隋文帝入禁中侍疾。 [/INST] At first, when Emperor Xuan was ill, he issued a decree for Emperor Wen of Sui to enter the palace to serve the emperor's illness.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 初，宣帝不豫，诏隋文帝入禁中侍疾。
user
At first, when Emperor Xuan was ill, he issued a decree for Emperor Wen of Sui to enter the palace to serve the emperor's illness.
assistant