Prohibitive Subjunctive.—The subjunctive (in the second and third persons of the aorist) is often used to express prohibitions (negative μή).
a. Usually in the second person:
b. Less commonly in the third person, which usually represents the second:
ὑπολάβῃ δὲ μηδείς
c. The third person of the present subjunctive is rare: μὴ τοίνυν τις οἴηται ( = μὴ οἰώμεθα) let not any one think P. L. 861 E.
N.—οὐ μή with the subjunctive of the second person in the dramatic poets occasionally expresses a strong prohibition:
οὐ μὴ ληρήσῃς
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].