Plato, Republic, book 3 405:

ἢ οὐκ αἰσχρὸν δοκεῖ καὶ ἀπαιδευσίασ μέγα τεκμήριον τὸ ἐπακτῷ παρ’ ἄλλων, ὡσ δεσποτῶν τε καὶ κριτῶν, τῷ δικαίῳ ἀναγκάζεσθαι χρῆσθαι, καὶ ἀπορίᾳ οἰκείων;