Xenophon Hellenica 5.4.1

[1]
  Now one could mention many other incidents, both among Greeks and barbarians, to prove that the gods do not fail to take heed of the wicked or of those who do unrighteous things; but at present I will speak of the case which is before me. The Lacedaemonians, namely, who had sworn that they would leave the states independent, after seizing possession of the Acropolis of Thebes were punished by the very men, unaided, who had been thus wronged, although before that time they had not been conquered by any single one of all the peoples that ever existed; while as for those among the Theban citizens who had led them into the Acropolis and had wanted the state to be in subjection to the Lacedaemonians in order that they might rule despotically themselves, just seven of the exiles were enough to destroy the government of these men. ¹ How all this came to pass I will proceed to relate.