Plato, Republic, book 3 539:

εἰε͂ν, ἦν δ’ ἐγώ· τὸ δὴ μετὰ τοῦτο τί ἂν ἡμῖν διαιρετέον εἰή; ἆρ’ οὐκ αὐτῶν τούτων οἵτινεσ ἄρξουσί τε καὶ ἄρξονται;