Plato, Laws 796c

πανοπλίᾳ δὲ παντελεῖ κοσμηθεῖσα, οὕτω τὴν ὄρχησιν διαπεραίνειν· ἃ δὴ πάντως μιμεῖσθαι πρέπον ἂν εἴη κόρους τε ἅμα καὶ κόρας, τὴν τῆς θεοῦ χάριν τιμῶντας, πολέμου τʼ ἐν χρείᾳ καὶ ἑορτῶν ἕνεκα. τοῖς δέ που παισὶν εὐθύς τε καὶ ὅσον ἂν χρόνον μήπω εἰς πόλεμον ἴωσιν, πᾶσι θεοῖς προσόδους τε καὶ πομπὰς ποιουμένους μεθʼ ὅπλων τε καὶ ἵππων ἀεὶ κοσμεῖσθαι δέον ἂν εἴη, θάττους τε καὶ βραδυτέρας ἐν ὀρχήσεσι καὶ ἐν πορείᾳ τὰς ἱκετείας ποιουμένους πρὸς θεούς

but rather to tread the measure vested in full panoply. These examples it would well become the boys and girls to copy, and so cultivate the favor of the goddess, alike for service in war and for use at festivals. It shall be the rule for the children, from the age of six until they reach military age, whenever they approach any god and form processions, to be always equipped with arms and horses, and with dance and march, now quick, now slow, to make their supplications to the gods and the children of gods.