History of the Peloponnesian War

Cleon, perceiving the disfavor with which he was regarded for having stood in the way of the convention, now said that their informants did not speak the truth; and upon the messengers recommending them, if they did not believe them, to send some commissioners to see, Cleon himself and Theagenes were chosen by the Athenians as commissioners.

Aware that he would now be obliged either to say what had been already said by the men whom he was slandering, or be proved a liar if he said the contrary, he told the Athenians, whom he saw to be not altogether disinclined for a fresh expedition, that instead of sending commissioners and wasting their time and opportunities, if they believed what was told them, they ought to sail against the men.