Book 5
38.1
In the mean time it was determined by the Boeotarchs, the Corinthians, the Megareans, and the ambassadors from Thrace, in the first place, to bind themselves by oaths to each other, that assuredly, when occasion offered, they would assist the party which needed it; and that they would carry on war with none, or make peace, without common assent; and that so the Boeotians and Megareans (for they had the same object before them) should then enter into treaty with the Argives.
38.2
But before the oaths were taken, the Boeotarchs communicated these resolutions to the four councils of the Boeotians, which have the sole power of ratifying measures; and recommended to them that oaths should be exchanged with such cities as wished to league with them for mutual assistance.