Plato, Laws 869a

τῷ τῆς περὶ ταῦτα ἀσεβείας εἰρημένῳ νόμῳ ὑπόδικος ὀρθῶς ἂν γίγνοιτο μετὰ δίκης. ἐὰν δʼ ἄρα τις εἰς τοσοῦτον ἀκρατὴς θυμοῦ γίγνηται πρὸς τοὺς γεννήσαντας, ὥστε μανίαις ὀργῆς τῶν γεννητόρων τολμῆσαι κτεῖναί τινα, ἐὰν μὲν ὁ τελευτήσας πρὶν τελευτῆσαι τὸν δράσαντα φόνου ἀφιῇ ἑκών, καθάπερ οἱ τὸν ἀκούσιον φόνον ἐξεργασάμενοι καθαρθείς, καὶ τἆλλα ὅσαπερ ἐκεῖνοι πράξας, καθαρὸς ἔστω, ἐὰν δὲ μὴ

and if anyone disobeys, he will rightly and justly be liable to the law laid down concerning such cases of impiety. If any man gets into such an uncontrollable rage with his parents as actually to dare to kill a parent in the madness of his rage, then, in case the dead person before dying voluntarily acquits the culprit of murder, he shall be held pure, after he has purified himself in the same manner as those who have committed an involuntary murder, and done as they