'Letters' in the Bible

Then I said to the king, “If it pleases the king, let letters be given to me for the governors of the provinces beyond the [Euphrates] River, so that they will allow me to pass through until I reach Judah,

Then I came to the governors of the provinces beyond the [Euphrates] River and gave them the king’s letters. Now the king had sent officers of the army and horsemen with me.

Moreover, in those days many letters went from the nobles of Judah to Tobiah, and Tobiah’s letters came to them.

Also, they were speaking about Tobiah’s good deeds in my presence, and reporting to him what I said. Then Tobiah sent letters to frighten me.