History of the Peloponnesian War
Thucydides
Thucydides. The history of the Peloponnesian War, Volume 1-2. Dale, Henry, translator. London: Heinemann and Henry G. Bohn, 1851-1852.
this, then, they considered an impediment on the part of the gods. Thus much they said on the subject of their former oaths: with regard to the Argive alliance, they would consult with their friends, and do whatever was right.
So the envoys of the Lacedaemonians returned home. But there happened to be in Corinth at that time some ambassadors from the Argives also, who urged the Corinthians to enter at once into their confederacy, and not delay. They, however, told them to come to the next congress which was to be held in their city.