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.
But not even then, nor relying on certain Helots who had turned informers, did they think it best to take harsh measures against him; they adhered to their usual method in dealing with men of their own class—not to be hasty, in the case of a Spartan, in adopting an irrevocable decision unless they had indisputable proofs. But at last, as it is said, the man who was to take to Artabazus Pausanias' last letter to the King, a man of Argilus who had once been a favourite of his and had hitherto been most loyal to him, turned informer. For he took fright when he called to mind that no previous messenger had ever come back again; and so, having made a counterfeit seal, in order that his act might not be discovered, in case he should be wrong in his suspicion or in case Pausanias should ask to make some alteration in the letter, he opened the letter and in fact found written therein, as he suspected he should find something of the sort to have been directed, an order for his own death.
At this point the ephors, when the man showed them the letter, were at last more nearly convinced, but they wished besides to hear with their own ears some word from Pausanias' own lips; so in accordance with a prearranged plan the man went as a suppliant to Taenarus and put up there a hut divided by a partition. In the inner room of the hut he concealed some of the ephors, and when Pausanias visited him and asked the reason of his taking the position of a suppliant, they heard clearly everything that was said: they heard the man accuse Pausanias of having written the order about himself, reveal the other items of the plot in detail, and protest that, though he had never yet compromised Pausanias in his errands to the King, the special honour awarded him was no better than that which the common run of his servants received—to be put to death; and they heard Pausanias acknowledge these same things, urge the man not to be angry with him this time, offer him a guarantee that he might leave the temple in safety, and finally request him to go on his way with all speed and not frustrate the negotiations.