The History Of Herodotus Volume 2 of 2
Page: 123146. When they had thus resolved, they reconciled their enmities and then sent first three men as spies to Asia. These having come to Sardis and having got knowledge about the king's army, were discovered, and after having been examined by the generals of the land-army were being led off to die. For these men, I say, death had been determined; but Xerxes, being informed of this, found fault with the decision of the generals and sent some of the spearmen of his guard, enjoining them, if they should find the spies yet alive, to bring them to his presence. So having found them yet surviving they brought them into the presence of the king; and upon that Xerxes, being informed for what purpose they had come, commanded the spearmen to lead them round and to show them the whole army both foot and horse, and when they should have had their fill of looking at these things, to let them go unhurt to whatsoever land they desired.
147. Such was the command which he gave, adding at the same time this saying, namely that if the spies had been put to death, the Hellenes would not have been informed beforehand of his power, how far beyond description it was; while on the other hand by putting to death three men they would not very greatly have damaged the enemy; but when these returned back to Hellas, he thought it likely that the Hellenes, hearing of his power, would deliver up their freedom to him themselves, before the expedition took place which was being set in motion; and thus there would be no need for them to have the labour of marching an army against them. This opinion of his is like his manner of thinking at other times; 133 for when Xerxes was in Abydos, he saw vessels which carried corn from the Pontus sailing out through the Hellespont on their way to Egina and the Peloponnese. Those then who sat by his side, being informed that the ships belonged to the enemy, were prepared to capture them, and were looking to the king to see when he would give the word; but Xerxes asked about them whither the men were sailing, and they replied: "Master, to thy foes, conveying to them corn": he then made answer and said: "Are we not also sailing to the same place as these men, furnished with corn as well as with other things necessary? How then do these wrong us, since they are conveying provisions for our use?"
148. The spies then, having thus looked at everything and after that having been dismissed, returned back to Europe: and meanwhile those of the Hellenes who had sworn alliance against the Persian, after the sending forth of the spies proceeded to send envoys next to Argos. Now the Argives report that the matters concerning themselves took place as follows:—They were informed, they say, at the very first of the movement which was being set on foot by the Barbarian against Hellas; and having been informed of this and perceiving that the Hellenes would endeavour to get their alliance against the Persians, they had sent messengers to inquire of the god at Delphi, and to ask how they should act in order that it might be best for themselves: because lately there had been slain of them six thousand men by the Lacedemonians and by Cleomenes the son of Anaxandrides, 134 and this in fact was the reason that they were sending to inquire: and when they inquired, the Pythian prophetess made answer to them as follows: