Passage 9.13.2
χρόνῳ δὲ ὕστερον κατὰ πρεσβείαν ἐς Σπάρτην ἥκοντα Ἐπαμινώνδαν, ὅτε Λακεδαιμόνιοι συντίθεσθαι τοῖς Ἕλλησιν ἔφασαν εἰρήνην τὴν ἐπὶ Ἀνταλκίδου καλουμένην, τηνικαῦτα Ἐπαμινώνδαν ἤρετο Ἀγησίλαος, εἰ κατὰ πόλιν ὀμνύναι Βοιωτοὺς ἐάσουσιν ὑπὲρ τῆς εἰρήνης· "οὐ πρότερόν γε" εἶπεν "ὦ Σπαρτιᾶται, πρὶν ἢ καὶ τοὺς περιοίκους ὀμνύοντας κατὰ πόλιν ἴδωμεν τοὺς ὑμετέρουσ" .
Some time afterward, Epaminondas arrived in Sparta on an embassy, when the Lacedaemonians said that they were ready to make peace with the Greeks on terms known as the peace of Antalcidas. At this time Agesilaus asked Epaminondas whether the Thebans would allow the oath concerning the peace to be sworn on a city-by-city basis. Epaminondas replied, "We will certainly not consent to that, Spartans, until we see your own perioikoi likewise swearing their oaths city by city."