Jussive Future.—The future may express a command, like the imperative; and, in the second person, may denote concession or
permission. The negative is οὐ. The tone of the jussive future (which is post-Homeric) is generally familiar.
ὣς οὖν ποιήσετε
σπουδὴ ἔσται τῆς ὁδοῦ
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].