William Watson Goodwin, Syntax of the Moods and Tenses of the Greek Verb

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[*] 70. In a few instances the future indicative with μή expresses a prohibition, like the imperative or subjunctive with μή (259). E.g.

• “Ταύτην, ἄν μοι χρῆσθε συμβούλῳ, φυλάξετε τὴν πίστιν πρὸς τοῦτον τὸν Θρᾷκα, καὶ μὴ βουλήσεσθε εἰδέναι, κ.τ.λ.,” “if you follow my advice, hold fast to this security (69) , and do not wish to know, etc.” DEM. xxiii. 117.
• “Ἐὰν δὲ εὖ φρονῆτε, καὶ νυνὶ τοῦτο φανερὸν ποιήσετε, καὶ μηδεμίαν αὐτοῖς ἄδειαν δώσετε.” LYS. xxix. 13.
• “Ξένον ἀδικήσεις μηδέποτε καιρὸν λαβών.” MEN. Mon. 397.

So probably “οὐ σῖγα; μηδὲν τῶνδ᾽ ἐρεῖς κατὰ πτόλιν,” “silence! say nothing of all this in the city.” AESCH. Sept. 250. (See 279.)