Plato, Laws 762c

τοὺς τόπους εἶναι συσσίτια, ἐν οἷς κοινῇ τὴν δίαιταν ποιητέον ἅπασιν· ὁ δὲ ἀποσυσσιτήσας κἂν ἡντιναοῦν ἡμέραν, ἢ νύκτα ἀποκοιμηθείς, μὴ τῶν ἀρχόντων ταξάντων ἢ πάσης τινὸς ἀνάγκης ἐπιπεσούσης, ἐὰν ἀποφήνωσιν αὐτὸν οἱ πέντε, καὶ γράψαντες θῶσιν ἐν ἀγορᾷ καταλελυκότα τὴν φρουράν, ὀνείδη τε ἐχέτω τὴν πολιτείαν ὡς προδιδοὺς τὸ ἑαυτοῦ μέρος, κολαζέσθω τε πληγαῖς ὑπὸ τοῦ συντυγχάνοντος καὶ

in each of the districts there shall be common meals, at which all shall mess together. If a man absents himself by day, or by sleeping away at night, without orders from the officers or some urgent cause, and if the Five inform against him and post his name up in the market-place as guilty of deserting his watch, then he shall suffer degradation for being a traitor to his public duty, and whoever meets him and desires to punish him may give him a beating