Plato, Laws 881b

κολάσεις περὶ τὰ τοιαῦτα τούτοισι τὰς ἐν τῷ ζῆν μηδὲν τῶν ἐν Ἅιδου λείπεσθαι κατὰ δύναμιν. ἔστω δὴ λεγόμενον τὸ μετὰ τοῦτο τῇδε· ὃς ἂν τολμήσῃ πατέρα ἢ μητέρα ἢ τούτων πατέρας ἢ μητέρας τύπτειν μὴ μανίαις ἐχόμενος, πρῶτον μὲν ὁ προστυγχάνων καθάπερ ἐν τοῖς ἔμπροσθεν βοηθείτω, καὶ ὁ μὲν μέτοικος ἢ ξένος εἰς προεδρίαν τῶν ἀγώνων καλείσθω βοηθῶν, μὴ βοηθήσας δὲ ἀειφυγίαν ἐκ τῆς χώρας φευγέτω·

upon other progenitors. Consequently, the punishments inflicted upon these men here in their lifetime for crimes of this kind must, so far as possible, fall in no way short of the punishments in Hades. So the next pronouncement shall run thus:—Whosoever shall dare to beat his father or mother, or their fathers or mothers, if he be not afflicted with madness,—in the first place, the bystander shall give help, as in the former cases, and the resident Stranger who helps shall be invited to a first-row seat at the public games, but he who fails to help shall be banished from the country for life;