'Letters' in the Bible

Now Ahab had seventy sons in Samaria. Jehu wrote letters, and sent to Samaria, to the rulers of Jezreel, even the elders, and to those who brought up [the sons of] Ahab, saying,

At that time Berodach Baladan the son of Baladan, king of Babylon, sent letters and a present to Hezekiah; for he had heard that Hezekiah had been sick.