'Letters' in the Bible

And Hezekiah sent to all Israel and Judah, and wrote letters also to Ephraim and Manasseh, that they should come to the house of Jehovah at Jerusalem, to hold the passover to Jehovah the God of Israel.

And the couriers went with the letters from the king and his princes throughout Israel and Judah, and according to the commandment of the king, saying, Ye children of Israel, return to Jehovah the God of Abraham, Isaac, and Israel, and he will return to the remnant of you that are escaped out of the hand of the kings of Assyria.