The Histories · 4.84

Then one of the Persians, Oiobazos, made request to Dareios that as he had three sons and all were serving in the expedition, one might be left behind for him: and Dareios said that as he was a friend and made a reasonable request, he would leave behind all the sons. So Oiobazos was greatly rejoiced, supposing that his sons had been freed from service, but Dareios commanded those who had the charge of such things to put to death all the sons of Oiobazos.

Herodotus of Halicarnassus · trans. G. C. Macaulay, 1890
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