History of the Peloponnesian War

Not long after this the ambassadors came to them from Argos to solicit the dispatch of the business before propounded; but the governors of Boeotia commended [only] the proposition and dismissed them with promise to send ambassadors about the league to Argos.

In the meantime the governors of Boeotia thought fit that an oath should first be taken by themselves and by the ambassadors from Corinth, Megara, and the confederates upon Thrace to give mutual assistance upon any occasion to them that should require it and neither to make war nor peace without the common consent; and next that the Boeotians and Megareans (for these two ran the same course) should make a league with the Argives.