Plato, Laws 916b

πρὸς τὸν τοιοῦτον τυγχάνειν, μηδʼ ἐὰν τἀληθές τις προειπὼν ἀποδῶταί τῳ· ἐὰν δέ τις ἰδιώτῃ τι τῶν τοιούτων ἀποδῶται δημιουργός, ὁ πριάμενος ἐντὸς ἑκμήνου ἀναγέτω, πλὴν τῆς ἱερᾶς, ταύτης δʼ ἐντὸς ἐνιαυτοῦ τὴν ἀναγωγὴν ἐξέστω ποιεῖσθαι τῆς νόσου. διαδικαζέσθω δὲ ἔν τισι τῶν ἰατρῶν, οὓς ἂν κοινῇ προβαλόμενοι ἕλωνται· τὸν δὲ ὀφλόντα τὴν δίκην διπλάσιον ἀποτίνειν τῆς τιμῆς ἧς ἂν ἀποδῶται. ἐὰν

But if any professional person sell any such slave to a lay person, the buyer shall claim restitution within six months, saving only in the case of epilepsy, for which disease he shall be permitted to claim within twelve months. The action shall be tried before a bench of doctors nominated and chosen by both the parties; and the party that loses his case shall pay double the selling price of the slave.