History of the Peloponnesian War
Thucydides
Thucydides. The history of the Peloponnesian War, Volume 1-2. Dale, Henry, translator. London: Heinemann and Henry G. Bohn, 1851-1852.
Alcibiades immediately sent a letter to Samos giving information against Phrynichus to the authorities there, telling them what he had done, and requiring that he should be put to death. Phrynichus, being confounded and in the most extreme danger, sent again to Astyochus, reproaching him because his former information had not been duly kept secret, and telling him now that he was prepared to give them an opportunity of destroying the whole Athenian armament at Samos; describing the particulars of the way in which he could do it, as Samos was unfortified; and pleading that it was not now culpable in him, being, as he was, in danger of his life through them, to do this, or any thing else, rather than be destroyed by his bitterest enemies. Astyochus gave information of this also to Alcibiades.