Eupolis, fr. 175 (Plutarch, Philosophers and Men in Power, 778d)

Neither fire, nor iron, nor bronze
can keep them from marching to dinner.

οὐ πῦρ οὐδε σίδηρος
οὐδὲ χαλκὸς ἀπείργει
μὴ φοιτᾶν ἐπὶ δεῖπνον