Histories
Herodotus
Herodotus. Godley, Alfred Denis, translator. Cambridge, MA; London: Harvard University Press; William Heinemann, Ltd., 1920-1925 (printing).
He saw some of the men exercising naked and others combing their hair. He marvelled at the sight and took note of their numbers. When he had observed it all carefully, he rode back in leisure, since no one pursued him or paid him any attention at all. So he returned and told Xerxes all that he had seen.