Plato, Laws 935c

μηδέποτʼ ἀριστείων πέρι φιλονικήσῃ, νόμων ὡς οὐ κηδόμενος οὐδὲ ποιῶν τὰ προσταχθέντα ὑπὸ τοῦ νομοθέτου. ἐὰν δέ τις ἐν ἄλλοις τόποις λοιδορίας ἄρχων ἢ ἀμυνόμενος ὁστισοῦν μὴ ἀπέχηται τῶν τοιούτων λόγων, ὁ προστυγχάνων πρεσβύτερος ὢν τῷ νόμῳ ἀμυνέτω, πληγαῖς ἐξείργων τοὺς θυμῷ, ἑτέρῳ κακῷ, φιλοφρονουμένους, ἢ ἐνεχέσθω τῇ τεταγμένῃ ζημίᾳ. λέγομεν δὴ τὰ νῦν ὡς λοιδορίαις συμπλεκόμενος

because of his neglect of the laws and his failure to execute the injunctions of the lawgiver. And if in other places a man abstains not from such language—whether he be the aggressor or acting in self-defence—whosoever meets with him, if he be an older man, shall vindicate the law by driving off with stripes the man who pamper passion, that evil comrade; or, if he fail to do so, he shall be liable to the appointed penalty. We are now asserting that a man who is gripped by the habit of abuse cannot avoid trying to indulge in ridicule; and this is a thing we abuse when it is uttered in passion.