'Letters' in the Bible

And I said to the king, “If it please the king, let letters be given me for the governors of the provinces beyond the River, that they may allow me to pass through until I come to Judah,

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

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

Moreover, they were speaking about his good deeds in my presence and reported my words to him. Then Tobiah sent letters to frighten me.