Cross reference
2 Kings 10:2
2 Straight away, when you get this letter, seeing that your master's sons are with you, and that you have carriages and horses and a walled town and arms;
2 Kings 5:6
6 And he took the letter to the king of Israel, in which the king of Aram had said, See, I have sent my servant Naaman to you to be made well, for he is a leper.