'Letters' in the Bible

And Hezekiah sendeth unto all Israel and Judah, and also letters he hath written unto Ephraim and Manasseh, to come in to the house of Jehovah in Jerusalem, to make a passover to Jehovah, God of Israel.

And the runners go with letters from the hand of the king and his heads, into all Israel and Judah, even according to the command of the king, saying, 'O sons of Israel, turn back unto Jehovah, God of Abraham, Isaac, and Israel, and He doth turn back unto the escaped part that is left of you from the hand of the kings of Asshur;

and letters he hath written to give reproach to Jehovah, God of Israel, and to speak against Him, saying, 'As the gods of the nations of the lands that have not delivered their people from my hand, so the God of Hezekiah doth not deliver His people from my hand.'