Plato, Laws 794a

μηδʼ ἀκολάστους ἐῶντας τρυφήν, ταὐτὸν δραστέον τοῦτό γε καὶ ἐπʼ ἐλευθέροισι. παιδιαὶ δʼ εἰσὶν τοῖς τηλικούτοις αὐτοφυεῖς τινες, ἃς ἐπειδὰν συνέλθωσιν αὐτοὶ σχεδὸν ἀνευρίσκουσι. συνιέναι δὲ εἰς τὰ κατὰ κώμας ἱερὰ δεῖ πάντα ἤδη τὰ τηλικαῦτα παιδία, ἀπὸ τριετοῦς μέχρι τῶν ἓξ ἐτῶν, κοινῇ τὰ τῶν κωμητῶν εἰς ταὐτὸν ἕκαστα· τὰς δὲ τροφοὺς ἔτι τῶν τηλικούτων κοσμιότητός τε καὶ ἀκολασίας ἐπιμελεῖσθαι, τῶν δὲ τροφῶν αὐτῶν καὶ τῆς ἀγέλης συμπάσης, τῶν δώδεκα

so in the case of the free-born the same rule holds good. Children of this age have games which come by natural instinct; and they generally invent them of themselves whenever they meet together. As soon as they have reached the age of three, all the children from three to six must meet together at the village temples, those belonging to each village assembling at the same place. Moreover, the nurses of these children must watch over their behavior, whether it be orderly or disorderly; and over the nurses themselves and the whole band of children