《后汉书·列传·光武十王列传》
刘强收到信后非常害怕，即抓住来使，把书信封住呈上去。
彊得书惶怖，即执其使，封书上之。
Liu Qiang was very scared after receiving the letter. He immediately captured the messenger and handed over the sealed letter to the emperor.
<s>[INST] Convert the following modern Chinese text into Classical Chinese: 刘强收到信后非常害怕，即抓住来使，把书信封住呈上去。 [/INST] 彊得书惶怖，即执其使，封书上之。</s>
Convert the following modern Chinese text into Classical Chinese: 刘强收到信后非常害怕，即抓住来使，把书信封住呈上去。
user
彊得书惶怖，即执其使，封书上之。
assistant