Plato, Laws 762d

ἐθέλοντος κολάζειν ἀτιμωρήτως. τῶν δὲ ἀρχόντων αὐτῶν ἐάν τίς τι δρᾷ τοιοῦτον αὐτός, ἐπιμελεῖσθαι μὲν τοῦ τοιούτου πάντας τοὺς ἑξήκοντα χρεών, ὁ δὲ αἰσθόμενός τε καὶ πυθόμενος μὴ ἐπεξιὼν ἐν τοῖς αὐτοῖς ἐνεχέσθω νόμοις καὶ πλείονι τῶν νέων ζημιούσθω· περὶ τὰς τῶν νέων ἀρχὰς ἠτιμάσθω πάσας. τούτων δὲ οἱ νομοφύλακες ἐπίσκοποι ἀκριβεῖς ἔστωσαν, ὅπως ἢ μὴ γίγνηται τὴν ἀρχὴν ἢ γιγνόμενα

with impunity. And if any one of the officers themselves commits any such act, it will be proper for all the Sixty to keep an eye on him; and if any of them notices or hears of such an act, but fails to prosecute, he shall be held guilty under the same laws, and shall be punished more severely than the young men; he shall be entirely disqualified from holding posts of command over the young men. Over these matters the Law-wardens shall exercise most careful supervision, to prevent if possible their occurrence, and, where they do occur, to ensure that they meet with the punishment they deserve.