'Letters' in the Bible

I also said to the king: “If it pleases the king, let me have letters written to the governors of the region west of the Euphrates River, so that they will grant me safe passage until I reach Judah.

I went to the governors of the region west of the Euphrates and gave them the king’s letters. The king had also sent officers of the infantry and cavalry with me.

During those days, the nobles of Judah sent many letters to Tobiah, and Tobiah’s letters came to them.

These nobles kept mentioning Tobiah’s good deeds to me, and they reported my words to him. And Tobiah sent letters to intimidate me.