《宋书·列传·卷六十五》
信还未送走，太祖又追回，发现信已打开，就要严加追查。
信未发又追取之，敕函已发，大相推检。
Before the letter had been sent away, Emperor Taizu summoned it back. Discovering that the letter had been opened, he intended to investigate the matter thoroughly.
<s>[INST] Translate the following Classical Chinese text into English: 信未发又追取之，敕函已发，大相推检。 [/INST] Before the letter had been sent away, Emperor Taizu summoned it back. Discovering that the letter had been opened, he intended to investigate the matter thoroughly.</s>
Translate the following Classical Chinese text into English: 信未发又追取之，敕函已发，大相推检。
user
Before the letter had been sent away, Emperor Taizu summoned it back. Discovering that the letter had been opened, he intended to investigate the matter thoroughly.
assistant