'Letters' in the Bible

Hezekiah also sent word to all of Israel and Judah, and wrote letters to Ephraim and Manasseh that they should come to the LORD's Temple in Jerusalem to observe the Passover to the LORD God of Israel.

Couriers were sent throughout all of Israel and Judah with letters written by the king and his princes, just as the king had commanded:

Sennacherib also wrote letters like this that insulted and slandered the LORD God of Israel: "Just as the gods of the nations in other lands haven't delivered their people from my control, so also the god of Hezekiah won't deliver his people from me!"