History of the Peloponnesian War

Aware of this, he told them that rumors are deceptive, and should not be trusted; they should send some reputable persons from Sparta to inspect, whose report might be trusted.

They despatched them accordingly. Concerning these Themistocles secretly sent word to the Athenians to detain them as far as possible without putting them under open constraint, and not to let them go until they had themselves returned. For his colleagues had now joined him, Abronichus, son of Lysicles, and Aristides, son of Lysimachus, with the news that the wall was sufficiently advanced; and he feared that when the Lacedaemonians heard the facts, they might refuse to let them go.

So the Athenians detained the envoys according to his message, and Themistocles had an audience with the Lacedaemonians, and at last openly told them that Athens was now fortified sufficiently to protect its inhabitants; that any embassy which the Lacedaemonians or their allies might wish to send to them, should in future proceed on the assumption that the people to whom they were going was able to distinguish both its own and the general interests.