History of the Peloponnesian War
Thucydides
Thucydides, Vol. 1-4. Smith, Charles Foster, translator. London and Cambridge, MA: Heinemann and Harvard University Press, 1919-1923.
And he on his arrival did other things as he was told and transmitted the letter. And this reply of the King ran as follows:
" Thus saith King Xerxes to Pausanias: As touching the men whom thou didst save for me out of Byzantium beyond the sea, a store of gratitude is laid up for thee, of record, in our house forever, and with thy words also I am pleased. And let neither night nor day stay thee to make thee remiss in performing aught of what thou dost promise mee; and let nothing hinder thee, either expense of gold and silver or number of troops, if there be need of their presence anywhere; but with Artabazus, a good man, whom I have sent to thee, transact with confidence my business and thine as shall be most honourable and best for both of us."